France on Saturday also recommended to all its citizens that they should leave Ukraine. For those in the most exposed areas "in the oblasts of Kharkiv, Luhansk and Donetsk," as well as in the region of Dnipro, Paris advises them to move away "without delay."
"It is recommended to all French citizens who are not in Ukraine for a compelling reason to leave the country," said the French Foreign Ministry.
In addition, the Austrian Foreign Ministry issued a similar warning for its citizens.
It follows unusually pessimistic US warnings that Moscow could order an invasion of Ukraine any day. NATO leaders have said they fear Russia is seeking a pretext to attack.
The past weeks have seen a flurry of diplomatic efforts as world leaders sought to avert a war in Europe amid soaring East-West tensions.
Some 150,000 troops Russian troops have amassed around Ukraine's borders — in the Russian border region, Belarus and the Ukrainian peninsula of Crimea annexed by Russia. Russia said the troops were there for maneuvers and that it had no intention of invading.