Russia has said it was pulling back troops from the eastern Kharkiv region of Ukraine as Kyiv announced massive territorial gains in its lightning counter-offensive.
Efforts to defuse the crisis in Ukraine have failed to ease tensions, with US President Joe Biden warning that Russia faces "swift and severe costs" if its troops carry out an invasion.
US President Joe Biden has urged Americans to immediately leave Ukraine, as Russia's live-fire drills and build-up of troops around the ex-Soviet state deepened fears of an invasion.