A Ukrainian soldier hides from a helicopter airstrike amid Russia's invasion of Ukraine, near Demydiv, Ukraine March 10, 2022. REUTERS/Maksim Levin TPX IMAGES OF THE DAY 

A member of the Ukrainian Territorial Defence Forces trains to throw Molotov cocktails to defend the city, as Russia's invasion of Ukraine continues, in Kyiv, Ukraine March 10, 2022. REUTERS/Mykola Tymchenko 

Ukrainian servicemen drive off in a Russian tank they captured after fighting with Russian troops, as Russia's attack on Ukraine continues, outside Brovary, near Kyiv, Ukraine, March 10, 2022. REUTERS/Thomas Peter TPX IMAGES OF THE DAY 

People flee near a destroyed bridge to cross Irpin River as Russia's invasion on Ukraine continues, in Irpin outside Kyiv, Ukraine, March 9, 2022. REUTERS/Mikhail Palinchak 

People walk with their luggage after they crossed the border from Ukraine to Poland, after fleeing the Russian invasion of Ukraine, at the border checkpoint in Medyka, Poland, March 10, 2022. REUTERS/Fabrizio Bensch 

A member of the Ukrainian security forces hands over a girl to a man as civilians wait to board a train while fleeing Russia's invasion of Ukraine, in Odessa, Ukraine, March 9, 2022. REUTERS/Alexandros Avramidis 

People and children wait near tents after crossing the border from Ukraine to Poland, after fleeing the Russian invasion of Ukraine, at the border checkpoint in Medyka, Poland, March 10, 2022. REUTERS/Fabrizio Bensch 

A man sleeps on the floor at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel TPX IMAGES OF THE DAY 

Olga hugs her boyfriend Vlodomyr as they say goodbye prior to Vlodomyr?s deployment closer to the front line, amid Russia's invasion of Ukraine, at the train station in Lviv, Ukraine, March 9, 2022. REUTERS/Kai Pfaffenbach 

A woman holds a child as they flee, amid Russia's invasion of Ukraine, in Odessa, Ukraine March 10, 2022. REUTERS/Igor Tkachenko 

A cat sits in a box at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel TPX IMAGES OF THE DAY 

People arrive by ferry, after fleeing from Russia's invasion of Ukraine, at the Isaccea-Orlivka border crossing, Romania, March 10, 2022. REUTERS/Stoyan Nenov 

A child sits in a mini bus as she and others flee, amid Russia's invasion of Ukraine, in Odessa, Ukraine March 10, 2022. REUTERS/Igor Tkachenko 

Greenpeace activists and volunteers hold torches and a Ukrainian flag as they stand forming a peace sign in solidarity with Ukraine, following Russia's invasion of Ukraine, at the Heroes' Square in Budapest, Hungary, March 9, 2022. REUTERS/Marton Monus 

A woman from the Lviv Volunteer Kitchen prepares food and dry rations for the Ukrainian military on the front lines, amid Russia's invasion of Ukraine, in Lviv, Ukraine, March 9, 2022. REUTERS/Pavlo Palamarchuk 

People arrive by ferry, after fleeing from Russia's invasion of Ukraine, at the Isaccea-Orlivka border crossing, Romania, March 10, 2022. REUTERS/Stoyan Nenov 

A mother waits with her children at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel 

A girl cries at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel 

A boy looks on as he sits on a floor at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel 

A Polish army soldier carries a bag with a dog of a refugee on their way to board a train after crossing the border from Ukraine to Poland, following the Russian invasion of Ukraine, at the border checkpoint in Medyka, Poland, March 9, 2022. REUTERS/Fabrizio Bensch 

People gather at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel 

A girl sleeps on a floor at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel 

A child sits at a platform as she waits at the train station after fleeing Russian invasion of Ukraine, in Przemysl, Poland, March 9, 2022. REUTERS/Yara Nardi 

A woman waits to board a bus at the accommodation centre, after fleeing Russian invasion of Ukraine, in Korczowa, Poland, March 9, 2022. REUTERS/Yara Nardi 

New members of the Territorial Defence Forces train to operate RPG-7 anti-tank launcher during military exercises amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY 

A boy looks on as he sits on a floor at the main hall of the Central train station, following the Russian invasion of Ukraine, in Warsaw, Poland March 9, 2022. REUTERS/Kacper Pempel