People board an evacuation train from Kyiv to Lviv at Kyiv central train station amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 3, 2022. REUTERS/Gleb Garanich 

A woman fleeing Russia's invasion of Ukraine sits on a train to Budapest departing from Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

Children sleep on the floor of the train station, after fleeing Russia's invasion of Ukraine, in Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

Children sit on the floor next to a woman as they rest at the train station after fleeing Russia's invasion of Ukraine, in Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

People fleeing Russia's invasion of Ukraine arrive at the train station in Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

People fleeing Russia's invasion of Ukraine rest at the train station in Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

A woman cuddles a dog at the train station after fleeing Russia's invasion of Ukraine, in Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

Indian students rest on the floor at the train station after fleeing Russia's invasion of Ukraine, in Zahony, Hungary March 3, 2022. REUTERS/Bernadett Szabo 

A woman  with her daughter looks out from an evacuation train from Kyiv to Lviv as she she says goodbye to her husband at Kyiv central train station in central Kyiv, Ukraine March 3, 2022. REUTERS/Gleb Garanich 

Two women rest outside a temporary accommodation centre after fleeing Russian invasion of Ukraine, in Korczowa, Poland, March 3, 2022. REUTERS/Yara Nardi 

A child sits outside a temporary accommodation centre after fleeing Russian invasion of Ukraine, in Korczowa, Poland, March 3, 2022. REUTERS/Yara Nardi 

People arrive at a temporary accommodation centre after fleeing Russian invasion of Ukraine, in Korczowa, Poland, March 3, 2022. REUTERS/Yara Nardi 

People arrive at a temporary accommodation centre after fleeing Russian invasion of Ukraine, in Korczowa, Poland, March 3, 2022. REUTERS/Yara Nardi 

A man arrives with his son at a temporary accommodation centre after fleeing Russian invasion of Ukraine, in Korczowa, Poland, March 3, 2022. REUTERS/Yara Nardi 

Children look out from an evacuation train from Kyiv to Lviv as they say goodbye to their father at Kyiv central train station in central Kyiv, Ukraine March 3, 2022. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY 

Refugees fleeing from Ukraine wait for transport at Nyugati station, following Russia's invasion of Ukraine, in Budapest, Hungary March 3, 2022. REUTERS/Marton Monus 

Refugees fleeing from Ukraine wait for transport at Nyugati station, following Russia's invasion of Ukraine, in Budapest, Hungary March 3, 2022. REUTERS/Marton Monus 

Refugees fleeing from Ukraine wait for transport at Nyugati station, following Russia's invasion of Ukraine, in Budapest, Hungary March 3, 2022. REUTERS/Marton Monus 

Refugees who fled from the Russian invasion in Ukraine rest inside a temporary camp at the train station in Przemysl, Poland, March 2, 2022. REUTERS/Kai Pfaffenbach TPX IMAGES OF THE DAY 

An elderly women comforts a child as they stay inside of an underground shelter located at a metro station as Russia's invasion of Ukraine continues, in Kyiv, Ukraine March 2, 2022. REUTERS/Carlos Barria TPX IMAGES OF THE DAY 

People are seen at the Les Kurbas Lviv Academic Theatre which became a shelter for evacuees from different parts of the country amid Russia's invasion of Ukraine, in Lviv, Ukraine March 3, 2022. REUTERS/Pavlo Palamarchuk 

A woman cries after fleeing from Russia's invasion of Ukraine, at the border crossing in Sighetu Marmatiei, Romania, March 3, 2022. REUTERS/Stoyan Nenov 

People wait for a passport contorl after fleeing from Russia's invasion of Ukraine at the border crossing in Sighetu Marmatiei, Romania, March 3, 2022. REUTERS/Stoyan Nenov 

A woman hugs a relative who fled from Russia's invasion of Ukraine, at the border crossing in Sighetu Marmatiei, Romania, March 3, 2022. REUTERS/Stoyan Nenov 

A group of people walk after fleeing from Russia's invasion of Ukraine, at the border crossing in Sighetu Marmatiei, Romania, March 3, 2022. REUTERS/Stoyan Nenov