The closure of the Canada-U.S. border has been extended to Feb. 21.

The border has been closed to all nonessential traffic since March. The closure agreement is reviewed by U.S. and Canadian government authorities each month.

ABC News’ Christine Theodorou contributed to this report.

U.S. Health and Human Services Secretary Alex Azar said the federal government will no longer hold back COVID-19 vaccine doses and is now recommending states inoculate anyone 65 and older as well as those under the age of 65 who have two or more conditions or illnesses.

"This is just a staging and moving to the next phase on the vaccine program. We've had so much success with quality and predictable manufacturing and almost flawless distribution of the vaccine, but we have seen now that the administration in the states has been too narrowly focused," Azar told ABC News chief anchor George Stephanopoulos in an interview Tuesday on Good Morning America.

"So, what are we doing? Three things. First, We have already made available every dose of vaccine," he said. "So we had been holding back second doses as a safety stock. We now believe that our manufacturing is predictable enough that we can ensure second doses are available for people from ongoing production. So everything is now available to our states and our health care providers."

"Second, we are calling on our governors to now vaccinate people age 65 and over and under age 65 with a comorbidity, because we have got to expand the group," he continued. "We've already distributed more vaccine than we have health care workers and people in nursing homes."

"Third, we've got to get more channels of administration," he added. "We've got to get it to pharmacies, get it to community health centers, and we are here and we will deploy teams to support states doing mass vaccination efforts if they wish to do so. It has been overly hospitalized so far in too many states."

As of 9 a.m. ET on Monday, more than 25 million COVID-19 vaccine doses have been distributed nationwide but fewer than 9 million people have received their first dose, according to data provided by the U.S. Centers for Disease Control and Prevention.

The European Medicines Agency (EMA) said Tuesday that it has received an application for conditional marketing authorization for the COVID-19 vaccine developed by England's University of Oxford and British-Swedish pharmaceutical giant AstraZeneca.

Conditional marketing authorization is the process used to speed up the approval of treatments and vaccines amid public health emergencies. The EMA said the assessment of the Oxford/AstraZeneca vaccine "will proceed under an accelerated timeline," and that an opinion on whether to issue an authorization could be announced by Jan. 29.

"If EMA concludes that the benefits of the vaccine outweigh its risks in protecting against COVID‑19, it will recommend granting a conditional marketing authorisation," the agency said in a statement Tuesday. "The European Commission will then fast-track its decision-making process with a view to granting a conditional marketing authorisation valid in all EU and EEA Member States within days."

Russia has extended its suspension of air travel with the United Kingdom through Feb. 1 amid growing concerns over a new, more contagious variant of the novel coronavirus.

"For the purpose of protecting public health, the restrictions have been extended through 11:59 p.m. on February 1, 2021," Russia's coronavirus response headquarters said in a statement Tuesday.

The ban was first imposed in late December.

The move comes after Russia confirmed its first cases of a new, highly infectious strain that is thought to have emerged in England late last year. The variant, called B117, is currently prevalent in London and other parts of southeastern England, and has since spread to more than a dozen other countries.

With more than 3.3 million confirmed cases of COVID-19, Russia has the fourth-highest tally of diagnosed infections in the world, followed by the U.K., according to a real-time count kept by Johns Hopkins University.

Russia's coronavirus response headquarters confirmed 22,934 new cases and 531 additional deaths from the disease on Monday, bringing the cumulative total to 3,448,203 cases with 62,804 deaths.

ABC News' Tanya Stukalova contributed to this report.

Weeks after video emerged of mostly maskless partygoers at U.S. President Donald Trump's Mar-a-Lago Club in Palm Beach, county officials are cracking down.

Palm Beach County sent a letter this week, acquired by ABC News, warning the club and saying officials had met with representatives from the club about violations. Masks are mandatory in the county in all businesses or establishments, and anywhere in public social distancing cannot be maintained. The mandate is currently in place through Jan. 20 -- the same day the county's most famous resident will be exiting the White House.

"Thank you for meeting with us last week to discuss the concerning allegations regarding the Mar a Lago New Year's Eve party and lack of facial coverings being worn during evening activities," the county wrote in the letter addressed to Bernd Lembcke, executive vice president and managing director of Mar-a-Lago Club.

"We recount that you provided masks for all party goers who attended the party and that you provided additional masks for those that walked from the reception area to the main dining ballroom," the letter continued. "Although you provided these important steps, it seemed that based on the video evidence, there was a breakdown in enforcement of the mask orders that led to almost the entire room of guests being without masks during the later evening activities."

The letter also includes a confirmation of the violation, which is a first-time warning, that lays out a fine of up to $15,000 for each potential future violation.

Trump has consistently downplayed wearing masks over the course of the entire pandemic. Despite telling people to wear masks on occasion at official briefings, he also mocked others for wearing them, including President-elect Joe Biden. Many supporters have decried mandates and openly flouted rules, including maskless Trump supporters who stormed the Capitol last week.

ABC News' Will Gretsky contributed to this report.