The departure may complicate the already delicate relationship between Washington and Kyiv, which has been stressed by President Trump’s efforts to end the war.

The U.S. ambassador to Ukraine is stepping down from her post after nearly three years in Kyiv. The departure of Bridget Brinks comes at a time of uncertainty over the Trump administration's attempts to broker a peace deal to end the Russia-Ukraine war.

More than 150 Chinese citizens are fighting in Ukraine alongside the Russian army, which is massing on the border of Ukraine ahead of a huge spring offensive, according to Ukrainian President Volodomyr Zelenskyy.