This handout photograph taken and released on January 31, 2024 by the Ukrainian presidential press service, shows Ukrainian former prisoners of war reacting following a prisoner exchange, amid Russia's military invasion on Ukraine. Russia and Ukraine exchanged hundreds of prisoners of war on January 31, just a week after Moscow said Kyiv had shot down a plane carrying dozens of captured Ukrainian soldiers. Russia's defence ministry said 195 of its soldiers were freed, while Ukrainian President Volodymyr Zelensky said 207 people -- both soldiers and prisoners – had returned to Ukraine. (Photo by Handout/Ukrainian Presidential Press Service via AFP Photo)





Ukrainian service members of the aerial reconnaissance unit of 45th Separate Artillery Brigade operate a Mara reconnaissance unmanned aerial vehicle from a dugout near the town of Lyman in Donetsk region, Ukraine on January 29, 2024. (Photo by Inna Varenytsia/Reuters)





Ukrainian servicemen fire a self-propelled howitzer “Bohdana” towards Russian positions near Bakhmut, Ukraine, Donetsk region, Ukraine, Friday, January 26, 2024. (Photo by Efrem Lukatsky/AP Photo)





A Ukrainian serviceman of the attack drones battalion of the Achilles 92nd brigade, prepares a shell for a drone at his front line position, as Russia's attack on Ukraine continues, near the town of Bakhmut in Donetsk region, Ukraine on February 1, 2024. (Photo by Inna Varenytsia/Reuters)





Ukrainian servicemen fly with a Vampire unmanned aerial vehicle (UAV) near a front line, amid Russia's attack on Ukraine, in Zaporizhzhia region, Ukraine on February 2, 2024. (Photo by Reuters/Stringer)





A Ukrainian serviceman of the attack drones battalion of the Achilles, 92nd brigade, operate a drone at his front line position, amid Russia's attack on Ukraine, near the town of Bakhmut in Donetsk region, Ukraine on February 2, 2024. (Photo by Inna Varenytsia/Reuters)





Ihor, a serviceman of the 59th Separate Motorised Infantry Brigade of the Armed Forces of Ukraine, with the call sign “Limuzyn”, smokes under camouflage nets near a frontline, amid Russia's attack on Ukraine, at an undisclosed location in the Donetsk region, Ukraine on February 4, 2024. (Photo by Alina Smutko/Reuters)





A Ukrainian serviceman of 80th Separate Galician Air Assault Brigade makes a snow angel in a bomb crater, amid Russia's attack on Ukraine, at a position near Bakhmut in Donetsk region, Ukraine on January 25, 2024. (Photo by Inna Varenytsia/Reuters)





Military medics give first aid to wounded Ukrainian soldiers at a medical stabilisation point near Bakhmut in Donetsk region, Ukraine on January 26, 2024. (Photo by Efrem Lukatsky/AP Photo)





Ukrainian border guards patrol the Ukrainian-Belarusian border in Chernigiv region on January 23, 2024, amid Russian invasion in Ukraine. (Photo by Sergei Supinsky/AFP Photo)





A Ukrainian serviceman of the Rarog UAV squadron of the 24th Separate Mechanized Brigade operates a first person view (FPV) drone at a position near the town of Horlivka, n Donetsk region, Ukraine, on January 17, 2024. (Photo by Inna Varenytsia/Reuters)





A Ukrainian serviceman of the First Presidential Brigade Bureviy (Hurricane) of the National Guard of Ukraine closes a door of an armoured personnel carrier before evacuation of an injured brother-in-arms from a position in a frontline, amid Russia's attack on Ukraine, near the town of Kreminna, Eastern Ukraine on February 6, 2024. (Photo by Serhii Nuzhnenko/Radio Free Europe/Radio Liberty)





Ukrainian border guards patrol the Ukrainian-Belarusian border in Chernigiv region on January 23, 2024, amid Russian invasion in Ukraine. (Photo by Sergei Supinsky/AFP Photo)





Ukrainian servicemen of the Rarog UAV squadron of the 24th Separate Mechanized Brigade operate a first person view (FPV) drone at a position near the town of Horlivka, amid Russia's attack on Ukraine, in Donetsk region, Ukraine on January 17, 2024. (Photo by Inna Varenytsia/Reuters)





A Ukrainian serviceman attends mock anti-sabotage drills near the border with Russia, in Sumy region, Ukraine on January 20, 2024. (Photo by Gleb Garanich/Reuters)