<span style="color: #222222;">The head of the United Nations' refugee agency has said that more than 1.5 million refugees have crossed from Ukraine into neighboring countries since Russian military operation.  <br />'' <br />'' The U.N. high commissioner for refugees, Filippo Grandi, tweeted on Sunday that it is the fastest-growing refugee crisis in Europe since World War II.<br />''<br />'' However, the UN agency did not immediately give a more precise update on the refugee figures.</span><br />