The United States and several European governments have demanded the release of opposition politician Alexei Navalny from Russian detention.
From 04:00 GMT on 18 January, people entering the UK must show evidence of a negative coronavirus test taken up to 72 hours before boarding their inbound flight.
The United Kingdom has banned arrivals from all South American countries and Portugal because of a new variant of coronavirus discovered in Brazil.
The curfew will come into force on Saturday and last for "at least" 15 days, he added.
Italy has been plunged into chaos after former prime minister Matteo Renzi withdrew his Italia Viva party from the country’s ruling coalition in a largely unpopular move that could end in fresh elections.
Britain is facing the worst weeks of the COVID-19 pandemic, its chief medical officer said on Monday, with the health service facing a “dangerous time” as deaths and cases hit record highs before the rollout of a mass vaccination programme.
Regulator backs third jab, but none of the 17m doses ordered will be available until spring