Russia so far has been relatively spared by the outbreak, with 1,836 cases and nine deaths, but the past few days have seen an increase in the number of cases.
President Vladimir Putin ordered the Russian military on Friday to work out a quid pro quo response after the test of a new U.S. missile banned under a now-defunct arms treaty.
Austrian Chancellor Sebastian Kurz said Monday he is seeking the removal of the country's interior minister over a video scandal that has rocked the Alpine nation in recent days.
The Trump administration said Friday it is freeing itself from the constraints of a nuclear arms control treaty with Russia and will begin withdrawing from the pact on Saturday.
Twenty-eight Russian athletes had their Olympic doping bans overturned Thursday, throwing the International Olympic Committee's policy on the country into turmoil.