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The number of people who have fled the war in Ukraine has reached 7,270,939, figures from the UN Refugee Agency show.
More than half have gone to Poland, where 3,817,564 refugees are registered, UNHCR data indicates.
Antonio Vitorino, director general of the UN's International Organisation for Migration, said "the scale of human suffering and forced displacement" was far worse than had initially been expected.
Women and children represent 90 per cent of the refugees, with Ukrainian men aged 18-60 unable to leave due to being eligible for military service.
Romania has taken in 613,435 refugees, while Hungary has accepted 731,098.
The figures show 491,144 people from Ukraine have fled to Moldova, 484,661 to Slovakia and 16,650 to Belarus.
A total of 1,116,387 people fleeing Ukraine have arrived in Russia since the full-scale invasion was launched on February 24.
While the outflow has slowed significantly since March, the UNHCR has projected that 3 million more Ukrainians could become refugees by the end of the year.
“The needs of those internally displaced and all affected by the war in Ukraine are growing by the hour,” Mr Vitorino said.
“Access to populations in need of aid remains a challenge amid active hostilities but our teams are committed to continue delivering urgent assistance inside Ukraine and in neighbouring countries.”
More than 12 million people were displaced in the first eight weeks of the war, Jan Egeland of the Norwegian Refugee Council told reporters.
“People talk about since the Second World War, [but] tell me when in the Second World War there were 12 million people displaced in eight weeks,” Mr Egeland said.
Displacement on that scale took place “over a longer period” back then, he said.
Almost two thirds of Ukrainian children have been displaced from their homes.
The war in Ukraine is a “child rights crisis” where education is under attack, nearly 100 youngsters have been killed in the past month alone and millions more have been forced to flee their homes, the UN children’s agency said.
Before the invasion, Ukraine had a population of 37 million in the regions under government control, excluding Russia-annexed Crimea and the pro-Russian separatist-controlled regions in the east of the country.
European Union and national leaders have been keen to talk of open borders and welcoming refugees. But moving across the continent is not easy, particularly for those who leave with few or no belongings and limited money.
The 27-nation EU has granted Ukrainian refugees the right to stay and work for up to three years, reviving a law that was dormant since the collapse of Yugoslavia in 1992.
If they cannot stay with friends or family, then the bloc has established reception centres to house them. Food and medical care are provided, as are welfare payments and access to schools.
UN's co-ordinated response
The UNHCR has not been limited to documenting the Ukrainian diaspora. It has also co-ordinated a humanitarian response, including attempting to send money to those who have fled.
It began a cash enrolment scheme in Ukraine on March 27.
The UNHCR has said “access to the hardest-hit areas remains extremely challenging, with continuing security risks, both for affected civilians as well as humanitarian actors”.
Ukrainian refugees arrive in Europe — in pictures
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A Ukrainian refugee waits to be given shelter in Amsterdam, the Netherlands. AFP -
Campaigner Rend Platings, right, embraces her Ukrainian best friend Kristina Korniiuk as they are reunited outside her home in Cambridge. Ms Platings went on hunger strike until MsKorniiuk's UK visa was approved and painted her house in the colours of the Ukrainian flag. PA -
Ukrainian women attend a job-seekers' meeting aboard the 'Mediterranee' ferry, where they are living while it remains docked in Marseille, southern France. AFP -
Refugee schoolchildren are given Ukrainian primary school education in Berlin, where they also have the choice of attending German schools. Getty -
Teacher Katja with Artem, Sofia and Alexander, refugee schoolchildren who are receiving Ukrainian curriculum primary school education in Berlin, Germany. Getty -
Ukrainian refugee Alikhan Yusupov, 10, on his first day at Caldecote Primary School after his family fled their home in Kharkiv and moved to Cambridgeshire, England. PA -
Roman Starkov plays with nephew Alikhan as they settle into their new home in Caldecote, near Cambridge, after they fled Kharkiv. PA -
Ukrainian refugee Egor Svichkar, 3, whose family now live with a British host. PA -
Ukrainian refugees Yaroslav Kryvoshyia and Irina Kryvoviaz, with her son Sasha as they settle into their new home in North Moreton, Oxfordshire. PA -
An Ukrainian refugee woman sews in Strasbourg, France, part of project for Ukrainian refugees to find jobs after fleeing the war. AFP -
Ukranian refugee Karolina, 16, laughs as she prepares for a party at the La Ville-aux-Dames camp site, her family's temporary home in La Ville-aux-Dames, central France. AFP -
Ukrainians queue outside a refugee centre in Paris. AFP -
Myroslava Perevalska (R), an artist who fled Kyiv, helps a Ukrainian girl paint Easter eggs in Berlin. Getty Images -
The 'Beacon of Ukraine', a gathering at Markthalle Neun in Berlin, bringing together refugees and NGOs as well as showcasing Ukrainian culture. Getty Images -
Larysa Biachenko, 40, who does not know if her house in Chernihiv is still standing, and Svitlana Lykhonos, 43, who was the owner of a hotel restaurant in Frankiusk, peel onions at a special cooking course run by the regional government to offer them a job opportunity, in Alicante, Spain. Reuters -
A convoy of Ukrainian refugees who left Mariupol, accompanied by 17 volunteers, arrive at Juan Carlos I park in Madrid. EPA -
Ukrainian refugees, who arrived in Italy from Lviv after two weeks of travel, are tended to in the reception centre of the Red Cross in Settimo Torinese, near Turin. EPA
