The UK has begun to withdraw staff from the British embassy in Ukraine amid warnings of a Russian invasion.
Officials say there have been no specific threats to British diplomats, but about half of the staff working in Kyiv will return to the UK.
The US has ordered relatives of its embassy staff to leave, saying an invasion could come "at any time."
Russia has denied plans for military action, but tens of thousands of troops have amassed on the border.
The embassy moves seem to be precautionary, and nothing specific is thought to have occurred in the past 24 hours to have triggered the decisions of the US and UK.
Staff working at the EU embassy will stay in place for now, with EU foreign policy chief Josep Borrell saying he would not "dramatise" the tension.