A child looks out from a window of a bus for refugees fleeing Russia's invasion of Ukraine, in Lviv, Ukraine, March 13, 2022. REUTERS/Pavlo Palamarchuk 

A two-month-old orphan boy, whom volunteers evacuated from the besieged city of Sumy, is seen at the Kyiv City Heart Center in Kyiv as Russia's attack on Ukraine continues, Ukraine, March 20, 2022. REUTERS/Thomas Peter TPX IMAGES OF THE DAY 

A member of the military holds the hand of a child as people flee, amid Russia's invasion of Ukraine, in Irpin, Ukraine, March 9, 2022. REUTERS/Maksim Levin REFILE-CORRECTING LOCATION 

A woman and her child, who fled Russia's invasion of Ukraine, are helped by a medic to board a train run by the Polish Red Cross and reserved for people who need medical care, to be transported to Wroclaw’s hospital, after crossing the border from Ukraine to Poland, in Medyka, Poland, March 16, 2022. REUTERS/Zohra Bensemra 

Egor, 5, comforts his mother Helen Yakubets who cries in a ballroom, which has been converted to a temporary shelter, at the Mandachi hotel after fleeing from Chernihiv in Ukraine to Romania, following Russia's invasion of Ukraine, at the border crossing in Suceava, Romania, March 20, 2022. Her 18 year old son and husband remain in Ukraine to fight. REUTERS/Clodagh Kilcoyne TPX IMAGES OF THE DAY 

Evacuees from the villages occupied by Russian soldiers arrive in the town of Brovary, amid Russia's invasion of Ukraine, near Kyiv, Ukraine, March 20, 2022. REUTERS/Marko Djurica TPX IMAGES OF THE DAY 

A Ukrainian refugee walks through the station after arriving on a train from Odesa at Przemysl Glowny train station, after fleeing the Russian invasion of Ukraine, in Przemysl, Poland, March 21, 2022.REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

Two refugees kids from Ukraine, fleeing the Russian invasion of Ukraine, runs towards a bus at a newly built arrival centre on the tarmac of the former Tegel airport in Berlin, Germany, March 22, 2022. REUTERS/Hannibal Hanschke TPX IMAGES OF THE DAY 

A woman fleeing Russia's invasion of Ukraine carries a child as she gets on a train to Budapest departing from Zahony, Hungary March 15, 2022. REUTERS/Bernadett Szabo 

Alexandra, 12, holds her sister Esyea, 6, who cries as she waves at her mother Irina, while members of the Jewish community of Odessa board a bus to flee Russia's invasion of Ukraine, in Odessa, Ukraine, March 7, 2022. REUTERS/Alexandros Avramidis TPX IMAGES OF THE DAY 

Alisa, a 3-year-old from Kharkiv, wraps herself with a blanket after crossing the border from Ukraine to Poland along with her mother, after fleeing the Russian invasion of Ukraine, at the border checkpoint in Medyka, Poland, March 9, 2022. REUTERS/Fabrizio Bensch 

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 

A woman cries as she comforts her son after learning she has to leave a bus which was reserved for the evacuation of orphans fleeing the ongoing Russian invasion outside the main train station in Lviv, Ukraine, March 5, 2022. REUTERS/Kai Pfaffenbach 

A man and a child escape from the town of Irpin, after heavy shelling on the only escape route used by locals, while Russian troops advance towards the capital of Kyiv, in Irpin, near Kyiv, Ukraine March 6, 2022. REUTERS/Carlos Barria 

A police officer says goodbye to his son as his family flees from advancing Russian troops as Russia's attack on Ukraine continues in the town of Irpin outside Kyiv, Ukraine, March 8, 2022. REUTERS/Thomas Peter TPX IMAGES OF THE DAY 

Rada, 2, eats after fleeing Kharkiv during Russia's invasion of Ukraine, at the border checkpoint in Medyka, Poland, March 11, 2022. REUTERS/Fabrizio Bensch 

People fleeing Russia's invasion of Ukraine play as they shelter in a school, in Drohobych, Ukraine, March 8, 2022. Picture taken March 8, 2022. REUTERS/Viacheslav Ratynskyi 

A member of military carries a baby as 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 

Anna, 7 years old is are covered in rescue blankets together with her doll fleeing the Russian invasion of Ukraine with her mother while wait to board a bus after crossing the border from Ukraine to Poland at the border checkpoint in Medyka, Poland, March 7, 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 

A baby is evacuated as 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 

Children looking out of a train window waiting for the departure to Poland following Russia?s invasion of Ukraine at the main train station in Lviv, Ukraine, March 4, 2022. REUTERS/Kai Pfaffenbach 

Children look on as people fleeing Russia's invasion of Ukraine shelter in a school, in Drohobych, Ukraine, March 8, 2022. Picture taken March 8, 2022. REUTERS/Viacheslav Ratynskyi 

A girl holds a doll as civilians fleeing Russia's invasion of Ukraine board a train, in Odessa, Ukraine, March 8, 2022. REUTERS/Alexandros Avramidis 

Newborn boy Ivan reacts nexts to his mother as they take shelter in the basement of a perinatal centre as air raid siren sounds are heard amid Russia's invasion of Ukraine, in Kyiv, Ukraine, March 2, 2022. REUTERS/Valentyn Ogirenko 

Rimma, a three-year-old girl evacuated from Mariupol area, holds a cat in a tent before leaving a refugee camp in the settlement of Bezymennoye for the territory of Russia during Ukraine-Russia conflict in the Donetsk region, Ukraine March 8, 2022. REUTERS/Alexander Ermochenko 

A boy sits in a shelter for people fleeing Russia's invasion of Ukraine, in Lviv, Ukraine, March 2, 2022. Picture taken March 2, 2022. REUTERS/Thomas Peter 

Refugees evacuated on a train from the Kyiv area, following the Russian invasion of Ukraine, arrive at the train station in Lviv, Ukraine, March 7, 2022. REUTERS/Kai Pfaffenbach 

People walk on a train platform as refugees flee Russia's invasion of Ukraine towards Poland, in the train station in Lviv, Ukraine March 5, 2022. REUTERS/Kai Pfaffenbach 

Refugees sitting in a train prior to their departure to Poland following Russia’s invasion of Ukraine at the main train station in Lviv, Ukraine, March 4, 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 

A local resident reacts to the sound of shell explosions while sitting near a child in a bomb shelter in the separatist-controlled settlement of Mykolaivka (Nikolaevka) in the Donetsk region, Ukraine March 1, 2022. REUTERS/Alexander Ermochenko 

A girl looks out of a train window waiting for the departure to Poland following Russia?s invasion of Ukraine at the main train station in Lviv, Ukraine, March 4, 2022. REUTERS/Kai Pfaffenbach 

A man carries a baby during an evacuation, as Russia's invasion of Ukraine continues, in the town of Irpin outside Kyiv, Ukraine, March 13, 2022. REUTERS/Marko Djurica 

A Ukrainian refugee Timur, 4, from Zaporizhzhia who has nowhere to go and after arriving with his relatives by bus from Przemysl, poses for a photo at the International Youth Meeting Center, around two kilometres away from the former Nazi German Auschwitz-Birkenau death camp, where they are provided with temporary accommodation, in Oswiecim, Poland, March 13, 2022. REUTERS/Fabrizio Bensch 

A boy sits in a bus for internally displaced people after he was evacuated from a Russian controlled area in Brovary outside Kyiv as Russia's invasion of Ukraine continues, Ukraine, March 13, 2022. REUTERS/Thomas Peter 

A child looks out from a bus window after fleeing from Ukraine to Romania, following Russia's invasion of Ukraine, at the border crossing in Siret, Romania, March 13, 2022. REUTERS/Clodagh Kilcoyne 

Children look at phones as people wait outside an immigration office after fleeing Russia's invasion of Ukraine, in Brussels, Belgium, March 13, 2022. REUTERS/Johanna Geron 

Olivia, 2, holds her rat Maja after arriving together with her relatives from Kyiv, at a temporary accommodation for people fleeing the Russian invasion of Ukraine, in Rzeszow, Poland, March 12, 2022. REUTERS/Fabrizio Bensch TPX IMAGES OF THE DAY