Nevada Gov. Steve Sisolak extended his state's coronavirus restrictions through at least Jan. 15 as COVID-19 cases and deaths surge in the Silver State.

Nearly every state in the U.S. reports more than 100 people hospitalized per million, according to the COVID Tracking Project. However, Nevada reports 592, which translates into one out of 1,700 people in the state, according to the project.

"We continue to see an increase of hospitalizations statewide with almost 1,700 Nevadans battling COVID as of Friday," Sisolak said at a press conference Sunday.

The governor also announced Sunday that he would sign an order to place a moratorium on most residential evictions in Nevada.

Since the start of the pandemic, Nevada has had more than 186,000 cases, with at least 2,529 deaths.

The first vaccinations in the state of Washington could be distributed as early as Tuesday, Gov. Jay Inslee said.

The initial shipment of the Pfizer vaccine arrives in the state on Monday.

"This is just fantastic news ... we are getting this vaccine," the governor said, adding he will get the vaccine himself when it is appropriate for his age group.

"Health care workers and long-term care residents will receive the vaccine first," he said.

The Korea Disease Control and Prevention Agency reported 1,030 newly diagnosed COVID-19 cases on Sunday, bringing the country's total to 46,645.

This is the first time since the beginning of the pandemic that South Korea broke the 1,000 mark in new cases and follows Saturday's record of 950 new cases.

Yonhap reports that President Moon Jae-in held an emergency meeting and called the current situation "the worst crisis" since the outbreak began and a "desperate time" when the government should make an all-out effort stem further infections.

-ABC News' Christine Theodorou

Italy's Civil Protection Agency reported 484 new deaths on Sunday, bringing the total number of fatalities in the country to 64,520, surpassing the United Kingdom which stands at 64,267, according to data from Johns Hopkins University.

There were 17,938 new COVID-19 cases reported in Italy, representing an 11.7% positivity rate and brings the total number of diagnosed cases to 1,843,712.

There have been a total of 372,965 deaths and 14,959,949 cases in the EU and the U.K., according to the European Centre for Disease Prevention and Control.

-ABC News' Christine Theodorou

The chief science adviser to Operation Warp Speed, the U.S. government's initiative to expedite vaccine development, said he doesn't know what vaccine-related executive order President Donald Trump is expected to sign on Tuesday.

"Frankly, I don't know and, frankly, I'm staying out of this. I can't comment," Dr. Moncef Slaoui told ABC News chief anchor George Stephanopoulos in an interview Tuesday on "Good Morning America."

When pressed on the matter, Slaoui added: "Our work is, you know, rolling. We have plans. We feel that we can deliver the vaccines as needed, so I don't exactly [know] what this order is about."

Trump is expected to discuss the order at a COVID-19 vaccine summit to be held at the White House later Tuesday, multiple White House officials told reporters during a background briefing on Monday evening. While it's not entirely clear on how exactly the order would work, the move is designed to prevent the U.S. government from shipping any vaccine doses it has purchased to aid foreign countries until all the needs within the United States are met.

White House officials also denied reports that the Trump administration turned down an offer last summer to purchase an additional 400 million doses of a COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech, and that the companies now may not be able to provide more of their vaccine to the United States until June 2021 because they have committed those doses to other countries.

When asked about the matter, Slaoui explained Operation Warp Speed's strategy in securing vaccine doses.

"We selected six different vaccines to build a portfolio to manage the risk that some may work and some may not work, but also to ensure that as more than one would work that we would accumulate vaccine doses from this portfolio of vaccines," he said. "If somebody came to us and said, let's buy more of this vaccine or that vaccine, no one reasonably would buy more from any one of those vaccines because we didn't know which one would work and which one may be better than the other. Once the vaccine's performance becomes known is the right time, given the strategy we've taken, to go and order more vaccine doses, which we may be doing. And frankly, the constructive thing to do if one of the suppliers has challenges producing enough vaccine doses is to roll our sleeves and help ensure that capacity can be increased."

Slaoui said he's confident the U.S. government will be getting vaccines to Americans who need them "as soon as possible" and that plans are "still on track."

"We will work with Pfizer to try and increase capacity and have those vaccines available," he said. "We have two more vaccines from J&J and AstraZeneca that will be completing their Phase 3 trials in January and most likely, I hope, be approved for use in February. We have tens of millions of doses from those vaccines, you know, participating to the volume of vaccines we need to immunize the U.S. population as we promised, all of it by the middle of the year 2021 and that's still on track."

Slaoui said Operation Warp Speed has a meeting with President-elect Joe Biden's transition team scheduled for Thursday.

"We look forward to, you know, sharing all the information and working together," he said. "Our objective has always been outside of politics and making sure we make available these vaccines for the U.S. people, and that's what we're doing."

ABC News' Ben Gittleson, John Parkinson and Eric Strauss contributed to this report.