Humanitarian aid for Ukraine is falling as its need only increases, the U.N. refugee agency UNHCR warned on May 20. In an interview with AFP, Karolina Lindholm Billing, the UNHCR’s representative in Ukraine, said there are 4 million displaced people in the country, including “some very, very vulnerable people.” Billing said the situation was only worsening as Russia’s full-scale invasion drags into its third year, but funding for international humanitarian aid was slowing down. The U.N. has a humanitarian plan for Ukraine that requires $3.1 billion this year, including $599 million for the UNH…