Kyiv said it would begin a truce on 6 May and then "act symmetrically" after Moscow declared a pause for its Victory Day parade.
Two cases of the virus, which rarely spreads between humans, have been confirmed on the ship, and three people have died.
Ilie Bolojan lost the vote after the largest party in his coalition joined the far-right opposition to depose him.
A 33-year-old German citizen was detained following the incident, the authorities say.
