BRUSSELS — American tourists who have been fully vaccinated against Covid-19 will be able to visit the European Union over the summer, the head of the bloc’s executive body said in an interview with The New York Times on Sunday, more than a year after shutting down nonessential travel from most countries to limit the spread of the coronavirus.

The fast pace of vaccination in the United States, and advanced talks between authorities there and the European Union over how to make vaccine certificates acceptable as proof of immunity for visitors, will enable the European Commission, the executive branch of the European Union, to recommend a switch in policy that could see trans-Atlantic leisure travel restored.

“The Americans, as far as I can see, use European Medicines Agency-approved vaccines,” Ursula von der Leyen, president of the European Commission, said Sunday in an interview with The Times in Brussels. “This will enable free movement and the travel to the European Union.

WASHINGTON — The Biden administration said Friday that it did not know that a Baltimore factory had discarded millions of possibly contaminated doses of AstraZeneca’s coronavirus vaccine when President Biden last month released the company to ship vaccines manufactured there to Mexico and Canada.

Canadian and Mexican officials said on Friday that they had assurances from AstraZeneca that the millions of doses they received were safe. Some of the doses have been distributed to the public in both countries, the officials said.

TOKYO — Japan on Friday declared states of emergency in Tokyo, Osaka and surrounding areas in an effort to stem a widening coronavirus outbreak three months before the country plans to host the Summer Olympics.

The measures will take effect on Sunday, Prime Minister Yoshihide Suga said, calling them “a short and concentrated measure” to slow the virus’s spread during the Golden Week holiday, traditionally one of the year’s busiest travel periods.