Prime Minister Benjamin Netanyahu said Israel would 'hermetically' close air travel, stopping most flights in and out of the country for at least a week to try to keep out coronavirus variants.

The police used tear gas, horses and water cannons to disperse anti-government demonstrators in Amsterdam and Eindhoven in the Netherlands on Sunday, who had gathered to protest a national coronavirus lockdown.

Demonstrators across Russia clashed with the police on Saturday as they turned out in support of the jailed opposition leader Aleksei A. Navalny.

Prime Minister Boris Johnson of Britain's scientific advisers urged restraint in interpreting preliminary evidence about the variant.

Dr. Anthony S. Fauci, President Biden's chief medical adviser for Covid-19, addressed reporters from the White House on Thursday, and warned the nation was 'still in a very serious situation' because of the pandemic.

In his first official full day in office, President Biden provided an update on his administration's Covid-19 response.

A limited supply of available vaccine doses has affected New York's Covid-19 vaccination efforts, with Gov. Andrew M. Cuomo saying the state will temporarily run out of vaccine in the next few days.

Vice President Kamala Harris swore in three new senators Wednesday: Jon Ossoff and the Rev. Raphael Warnock of Georgia, and Alex Padilla of California. Democrats now have narrow control of the Senate.

The head of the World Health Organization says that the promise of equitable access to the vaccines 'is at serious risk.'

After recovering from a near-fatal poisoning in Germany, the Russian opposition leader Aleksei A. Navalny returned to Moscow on Sunday and was detained at the airport.