Fire fighters, emergency service vehicles and a helicopter in Moskovsky Prospekt at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow timeon April 3, 2017. (Photo by Peter Kovalev/TASS)

Yakutsk, with a population of around 270,000, holds its own title: that of the coldest city on Earth. Here: Frost-encrusted house in the city centre. (Photo by Amos Chapple/Courtesy Images/RFE/RL)

These Northern Lights “rainbows” have turned the sky greener than the Earth below. Vitaly Istomin, 26, spent several nights in freezing conditions under the stars in northern Russia’s Khibiny Mountains to capture the aurora’s “rainbows”. (Photo by Vitaly Istomin/Caters News Agency)

A girl in a swimsuit participates in the BoogelWoogel alpine carnival at the Rosa Khutor Alpine Resort in Krasnaya Polyana, Sochi, Russia on March 31, 2018. (Photo by Artur Lebedev/TASS)

A mobile phone cover with a picture of Russian President Vladimir Putin and which reads “Mr President” is seen in this photo illustration taken a in hotel room in Kazan, Russia, July 30, 2015. He may be in charge of an economy in crisis, but if mobile phone covers and souvenir mugs are a barometer of popularity, Russian President Vladimir Putin need not fear for his political future. In fact, Moscow's annexation of Crimea from Ukraine last year has given the memorabilia makers even more material to glorify, sometimes wryly, a president whose image as a champion of Russian national interests in a hostile world is barely challenged in his own country. (Photo by Stefan Wermuth/Reuters)

In this handout photo released by Kooperativ Telegram Channel, flames and smoke rise from the scene after a warplane crashed into a residential area in Yeysk, Russia, Monday, October 17, 2022. The Russian military says one of its warplanes has crashed near an apartment building in Yeysk, a port city on the Sea of Azov, after experiencing engine failure on takeoff. The crash ignited a huge fire, killing at least four people, leaving six missing and injuring 21 others, eight of whom were in grave condition. One of the pilots, right, descends on a parachute. (Photo by Kooperativ Telegram Channel via AP Photo)

Police and the Russian National Guard (Rosgvardia) servicemen patrol Red Square in front of the Spasskaya tower of the Kremlin in Moscow on October 24, 2022, as part of security reinforcement measures. (Photo by Alexander Nemenov/AFP Photo)

A boy watches fireworks from a military range weapon, marking the Defender of the Fatherland Day celebrations, at the Artillery Museum in St. Petersburg, Russia, Thursday, February 23, 2023. (Photo by Dmitri Lovetsky/AP Photo)