British-based Ukrainians gather outside the Russian Embassy in London to protest against the build-up of troops in the Crimea region, on March 2, 2014. The demonstrators chanted and held banners demanding “Hands off Ukraine”. (Photo by John Stillwell/PA Wire)

Members of Crimean self-defence units stand guard in front of the local government headquarters in Simferopol March 2, 2014. Ukraine mobilised for war on Sunday and Washington threatened to isolate Russia economically, after President Vladimir Putin declared he had the right to invade his neighbour, creating Moscow's biggest confrontation with the West since the Cold War. (Photo by Thomas Peter/Reuters)

Police detain an activist protesting against recent developments in Russian-Ukrainian relations during an unsanctioned rally on the Manezh Square in Moscow, Russia, Sunday, March 2, 2014. (Photo by Pavel Golovkin/AP Photo)

Pro-Russian militants station themselves behind a row of shields near a local government building and a statue of Lenin on March 2, 2014 in Simferopol, Ukraine. The new government of Ukraine has appealed to the United Nations Security Council for help against growing Russian intervention in Crimea, where thousands of Russian troops reportedly arrived in recent days at Russian military bases there and also occupy key government and other installations. World leaders are scrambling to persuade Russian President Vladimir Putin to refrain from further escalation in Ukraine. Ukraine has put its armed forces on combat alert. (Photo by Sean Gallup/Getty Images)

Ukrainian military personnel stand guard in the Crimean port city of Feodosia on Sunday. Ukraine is mobilizing for war, calling up reserve troops. (Photo by Thomas Peter/Reuters)

Armed men patrol in the centre of the Crimean city of Simferopol March 1, 2014. Ukraine's defence minister said on Saturday Russia had “recently” brought 6,000 additional personnel into Ukraine and that the Ukrainian military were on high alert in the Crimea region. (Photo by Reuters/Stringer)

An armed man patrols near the regional parliament building in the Crimean city of Simferopol March 1, 2014. Ukraine's prime minister said on Saturday his country would not be drawn into a military conflict by Russian “provocations” in the Crimea region and appealed to Moscow to halt military movements there. (Photo by David Mdzinarishvili/Reuters)

Protesters opposing Russia's move to seize the Crimean Peninsula attend a funeral for Vlad Zubenko, who was killed in recent clashes with police in Kiev, in the eastern Ukrainian city of Kharkiv, on March 2, 2014. (Photo by Uriel Sinai/The New York Times)

An elderly woman wearing a sign that reads “War against Ukraine is madness” is detained by riot police during an unsanctioned anti-war rally close to the Kremlin at Manezhnaya Square on March 2, 2014 in Moscow, Russia, Dozens of protesters were detained by police on Sunday during a rally against the military intervention in the Ukraine, after the parliament in Moscow gave President Vladimir Putin approval to use Russian military forces in Ukraine. (Photo by Sasha Mordovets/Getty Images)

A protester holds a modified magazine cover depicting Russian President Vladimir Putin during a protest march in Kharkiv, on March 2, 2014. Ukraine's premier said on Sunday that the nation was on the brink of disaster. (Photo by Uriel Sinai/The New York Times)

Protesters holding flags from USA, Germany and Italy, arrive at Independence Square during a rally in Kiev Ukraine, Sunday, March 2, 2014. Ukraine's new prime minister urged Russian President Vladimir Putin to pull back his military Sunday in the conflict between the two countries, warning that “we are on the brink of disaster”. The comments from Arseniy Yatsenyuk came as a convoy of Russian troops rolled toward Simferopol, the capital of Ukraine's Crimea region, a day after Russian forces took over the strategic Black Sea peninsula without firing a shot. (Photo by Emilio Morenatti/AP Photo)

A demonstrator holds a poster reading “Putin, Hands off Ukraine” during a demonstration in front of the Russian embassy in Berlin, Germany Sunday March 2, 2014. (Photo by Britta Pedersen/AP Photo/DPA)

Demonstrators hold a minute of silence to commemorate the victims of the power struggles in Ukraine and remember the Soviet-Russian interventions in the past with placards reading “East Germany (GDR) in 1953, Hungary in 1956, Czechoslovakia in 1968, Afghanistan in 1979, Georgia in 2008, Ukraine in 2014?” during a demonstration in front of the Russian embassy in Berlin, Germany, Sunday March 2, 2014. More than 200 people gathered for the protest against a possible military intervention of Russia in Ukraine. (Photo by Britta Pedersen/AP Photo/DPA)

Demonstrators gather outside the Russian Embassy in Vilnius, Lithuania, to protest against Russian intervention in Ukraine Sunday, March 2, 2014. A convoy of Russian troops rolled toward Simferopol, the capital of Ukraine's Crimea region, a day after Russian forces took over the strategic Black Sea peninsula without firing a shot. The parliament in Moscow gave President Vladimir Putin a green light Saturday to use the military to protect Russian interests in Ukraine. (Photo by Mindaugas Kulbis/AP Photo)

Demonstrators gather outside the Russian Embassy in Vilnius, Lithuania, to protest against Russian intervention in Ukraine Sunday, March 2, 2014. Poster reads “Putin out of Ukraine”. A convoy of Russian troops rolled toward Simferopol, the capital of Ukraine's Crimea region, a day after Russian forces took over the strategic Black Sea peninsula without firing a shot. The parliament in Moscow gave President Vladimir Putin a green light Saturday to use the military to protect Russian interests in Ukraine. (Photo by Mindaugas Kulbis/AP Photo)

Pro-Russian sympathizers, including one man holding a sign that reads: “We will free Ukraine from American occupation” and an elderly woman holding another that reads: “Yankee Go Home!”, attend an anti-American rally hours after heavily-armed, unidentifed soldiers took up positions around the nearby Crimean Parliament on March 1, 2014 in Simferopol, Ukraine. The soldiers' arrival comes the day after soldiers in similar uniforms stationed themselves at Simferopol International Airport and Russian soldiers occupied the airport at nearby Sevastapol in moves that are raising tensions between Russia and the new Kiev government. Crimea has a majority Russian population and armed, pro-Russian groups have occupied government buildings in Simferopol. (Photo by Sean Gallup/Getty Images)

More than ten thousand pro-Kremlin demonstrators many holding Russian flags march in central Moscow, Russia, Sunday, March 2, 2014 to express support for the latest developments in Russian-Ukrainian relations. (Photo by Pavel Golovkin/AP Photo)

Police detain a protester demonstrating against the Russian military's actions in Crimea and developments in Russian-Ukrainian relations during an unsanctioned rally in St.Petersburg, Russia, Sunday, March 2, 2014. Russian President Vladimir Putin has defied calls from the West to pull back his troops, insisting that Russia has a right to protect its interests and the Russian-speaking population in Crimea and elsewhere in Ukraine. (Photo by Dmitry Lovetsky/AP Photo)

Pro-Kremlin demonstrators dressed in WWII army uniforms and carrying replicas of Soviet Army WWII banners reading, Ukrainian Front, march in central Moscow, Russia, Sunday, March 2, 2014 to express support for the latest developments in Russian-Ukrainian relations. Banners are those of units that were liberating Ukraine from Nazi occupation during WWII. (Photo by Pavel Golovkin/AP Photo)

Police detain a protester demonstrating against the Russian military actions in Crimea and developments in Russian-Ukrainian relations during an unsanctioned rally in St.Petersburg, Russia, 02 March 2014. Russia ratcheted tension in the Ukraine crisis on 01 March with its upper house of parliament approving the use of armed forces in the Crimean peninsula, which is part of Ukraine. Interim Ukrainian president Oleksandr Turchynov on 01 March has placed Ukraine's military on high alert in response to Russia's possible military intervention in Ukraine. Russian President Vladimir Putin the same day told US President Barack Obama that if violence keeps spreading in eastern Ukraine and Crimea, Moscow will reserve its right to protect its own interests and those of the Russian-speaking population there. “The troops are already there”, said Ukrainian UN Ambassador Yuriy Sergeyev at an emergency meeting of the Security Council and called on Russia to respect Ukraine's territorial integrity, saying the presence of Russian troops in Crimea was illegal and an “act of aggression”. (Photo by Anatoly Maltsev/EPA)

Police officers with dogs walk in front of more than ten thousand pro-Kremlin demonstrators many holding Russian flags march in central Moscow, Russia, Sunday, March 2, 2014 to express support for the latest developments in Russian-Ukrainian relations. (Photo by Pavel Golovkin/AP Photo)

Russian soldiers in combat fatigues patrol the streets of Feodosiya, on the Black Sea, with armored vehicles and tanks, on March 1, 2014. (Photo by Reuters/Stringer)

Turks of Crimean Tatar origin waves Crimean flags and hold a banner that reads “Crimea is the homeland of Crimean Tatars” as they demonstrate to protest against Russia's military intervention in Crimea, Ukraine, in Ankara, Turkey, Sunday, March 2, 2014. (Photo by Burhan Ozbilici/AP Photo)

Turks from Crimean Tatar origin wave Turkish and Crimean flags as they demonstrate to protest against Russia's military intervention in Crimea, Ukraine, in Ankara, Turkey, Sunday, March 2, 2014. Ukraine's new prime minister urged Russian President Vladimir Putin to pull back his military Sunday in the conflict between the two countries, warning that “we are on the brink of disaster”. The comments from Arseniy Yatsenyuk came as a convoy of Russian troops rolled toward Simferopol, the capital of Ukraine's Crimea region, a day after Russian forces took over the strategic Black Sea peninsula without firing a shot. The banner reads: “No to military intervention in Crimea!” (Photo by Burhan Ozbilici/AP Photo)

Turks of Crimean Tatar origin demonstrate to protest against Russia's military intervention in Crimea, Ukraine, in Ankara, Turkey, Sunday, March 2, 2014. The placard reads: “We are not a handful, but a united nation!” (Photo by Burhan Ozbilici/AP Photo)

Unidentified gunmen guard Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. (Photo by Darko Vojinovic/AP Photo)

Turks of Crimean Tatar origin waves Turkish and Crimean flags as they demonstrate to protest against Russia's military intervention in Crimea, Ukraine, in Ankara, Turkey, Sunday, March 2, 2014 The placard reads: “Russia hand off Crimea!” (Photo by Burhan Ozbilici/AP Photo)

Turks of Crimean Tatar origin wave Turkish and Crimean flags as they demonstrate to protest against Russia's military intervention in Crimea, Ukraine, in Ankara, Turkey, Sunday, March 2, 2014. The banner reads: “Crimean Tatars”. (Photo by Burhan Ozbilici/AP Photo)

People hold photos of their relatives killed during recent clashes, during a rally in Kiev's Independence Square, Ukraine, Sunday, March 2, 2014. Ukraine's new prime minister urged Russian President Vladimir Putin to pull back his military Sunday in the conflict between the two countries, warning that “we are on the brink of disaster”. (Photo by Emilio Morenatti/AP Photo)

An unidentified armed man stands guard outside a Ukraine infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles – which have Russian license plates – have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (Photo by Darko Vojinovic/AP Photo)

Ukrainian soldiers, left and unidentified gunmen, right, guard the gate of an infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. (Photo by Darko Vojinovic/AP Photo)