The United States plans to accept up to 100,000 refugees fleeing the war in Ukraine, a person familiar with the decision says -- a major step toward easing a brewing humanitarian crisis in Europe.

President Joe Biden was expected to unveil the decision as he travels in Europe to rally support behind a united approach to the crisis.

Leaders from Poland in particular have called on the US to expedite the processing of refugees with family in the US.

More than 3.6 million people have now fled Ukraine, according to the latest update from the UN Refugee Agency.