As many as one million refugees have left Ukraine in seven days since the beginning of Russia`s military operation there, said the UN Refugee Agency (UNHCR) on Thursday.

Taking to his Twitter handle, UNHCR high commissioner Filippo Grandi said, "In just seven days we have witnessed the exodus of one million refugees from Ukraine to neighbouring countries. For many millions more, inside Ukraine, it`s time for guns to fall silent, so that life-saving humanitarian assistance can be provided."