Ukrainians rallied in Kyiv on Saturday to show unity as international warnings of a Russian invasion sharpened.
Ukraine's president, Volodymyr Zelenskiy, told people not to panic, but more than 100,000 Russian troops are positioned near Ukraine and have carried out large-scale exercises, increasing tensions.
The US said on Friday an invasion could start at any moment, but Russia denied having any plans to launch one.
Ukraine crisis: latest updates
Russia and Belarus begin military drills near Belarusian border with Ukraine