The United Nations High Commissioner for Refugees (UNHCR) has counted 3,901,713 Ukrainian refugees and this number could exceed four million in the coming days, according to data made available Tuesday on the agency's official website.
According to UNHCR quoted by Negócios, 38,916 more Ukrainians have left their country than the numbers released on Monday.
Since March 22, the flow of refugees has slowed sharply, to about 40,000 daily crossings, and the four million barrier projected by UNHCR at the beginning of the conflict could be surpassed in the coming days.
In total, more than 10 million people, more than a quarter of the population, have had to leave their homes by crossing the border to find refuge in neighboring countries or elsewhere in Ukraine.
The UN has estimated the number of internally displaced persons at nearly 6.5 million.
Some 90% of those who have fled Ukraine are women and children. According to the United Nations Children's Fund (UNICEF), more than 1.5 million children are among those who have fled.
Prior to this conflict, Ukraine had a population of over 37 million people in the Kiev-controlled territories - which therefore does not include the Crimea (south) annexed in 2014 by Russia, nor the eastern areas under pro-Russian separatist control in the same year.
Poland is home to well over half of all refugees from Ukraine since the start of the Russian invasion. Since February 24, when the invasion began, 2,314,623 of Ukrainians have entered Poland, according to the UNHCR survey released on March 28.
Before this crisis, Poland was already home to about 1.5 million Ukrainians who mostly came to work in this European Union member country.
According to the UN refugee agency, 602,461 people have fled to Romania as of March 28.
After arriving in Moldova, a small country of 2.6 million people and one of the poorest in Europe, some of the refugees continue their journey to Romania or Hungary, often to find family members. According to UNHCR, 385,222 people have entered Moldova as of March 28.
Hungary received 359,197 Ukrainians in the same period, according to UNHCR data. The country has five border crossings with Ukraine. As of March 28, a total of 278,238 people have arrived in Slovenia from Ukraine since the start of the war, according to the UNHCR.
The number of people who have taken refuge in Russia is almost 271,254 as of March 22, which is the latest figure available.
UNHCR also noted that between February 21 and 23, 113,000 people crossed from the pro-Russian separatist territories of Donetsk and Lugansk into Russia. As of March 28, Belarus had received 9,875 people.
Russia launched a military offensive in Ukraine on February 24 that killed at least 1,151 civilians, including 103 children, and wounded 1,824, including 133 children, according to the latest figures from the UN, which warns that the actual number of civilian casualties is likely to be much higher.
The UN estimates that some 13 million people are in need of humanitarian assistance in Ukraine.
The Russian invasion was condemned by the international community at large, which responded by sending arms to Ukraine and strengthening economic and political sanctions on Moscow.