The United States will ban imports of Russian oil and other energy products but will not be joined in doing so by European allies, President Joe Biden announced Tuesday.

“Today, I'm announcing the United States is targeting the main artery of Russia's economy," Biden told reporters during a press conference from the White House. "We're banning all imports of Russian oil and gas and energy."

Biden said the ban means the U.S. "will deal another powerful blow" to Russian President Vladimir Putin amid his invasion of neighboring Ukraine. The move is also expected to trigger sharply higher gasoline and other energy prices in the U.S. and worldwide.

"There will be cost as well here in the United States," he added. "Republicans and Democrats understand, alike, understand that."

The decision was made in "close consultation" with U.S. allies and partners around the world, particularly in Europe, according to Biden.

"Because a united response to Putin's aggression has been my overriding focus, to keep all NATO and all the EU and our allies totally united," he said. "We're moving forward, understanding that many of our European allies and partner may not be in a position to join us."

-ABC News' Ben Gittleson and Molly Nagle

The United Kingdom will phase out the import of Russian oil and oil products by the end of the year, as part of its sanctions on Moscow for invading Ukraine, U.K. Buiness Secretary Kwasi Kwarteng announced Tuesday.

"Beyond Russia, the vast majority of our imports come from reliable partners such as the US, Netherlands and the Gulf. We’ll work with them this year to secure further supplies," Kwarteng said on his official Twitter account.

Kwarteng noted that while the U.K. "is not dependent" on Russian natural gas, as it only makes up 4% of the U.K's supply, he is exploring options to "end this altogether."

"The market has already begun to ostracise Russian oil, with nearly 70% of it currently unable to find a buyer," he added.

-ABC News' Joe Simonetti

Yegor Gordeev, host of the Ukrainian television morning show "Breaking with 1+1," said he and his coworkers have had to evacuate the studio during broadcast several times as air raid sirens ring out across Kyiv.

"I'm not in studio, I'm in bomb shelter," Gordeev told ABC News' George Stephanopoulos during an interview Tuesday on "Good Morning America."

"In Ukraine, we have no shows now, we have no TV channels now, we have only one big broadcast for controlled information to audience, for communication with audience for everything," he added.

It was a bloody day in the Ukrainian capital, according to Gordeev. He said the Ukrainian Air Force shot down a Russian aircraft in the center of Kyiv early Tuesday morning, while a Russian rocket destroyed the city's largest bakery, killing 30 people.

Gordeev said he hopes for peace in his home country but he's "not sure."

"In 21st century, it's barbarian war," he said in disbelief. "Putin is unstoppable."

The Russian Ministry of Defense claimed Tuesday that Ukrainian authorities are "categorically against" evacuating residents of Kyiv, Chernihiv, Sumy, Kharkiv and Mariupol to Russia.

"The authorities in Kyiv are continuing to categorically reject all main routes of evacuation from Kyiv, Chernihiv, Sumy, Kharkiv, and Mariupol to the territory of the Russian Federation," Mikhail Mizintsev, head of the Russian National Defense Control Center, said at a press briefing.

The Russian defense ministry alleged that the Ukrainians only confirmed one of the 10 evacuation routes Russia proposed. The confirmed route is from the city of Sumy, through Poltava and to the border with Poland, Mizintsev said.

The Russian defense ministry also claimed that more than 2.5 million Ukrainians have asked to be evacuated to Russia.

"Following the past day, 2,541,367 appeals from individual Ukrainian citizens, as well as foreigners made via various communication channels requesting to save and evacuate them from 1,917 settlements in Ukraine have already been processed in our database," Mizintsev said.

The Russian defense ministry further alleged that checkpoints in Poland, Slovakia, Hungary, Moldova and Romania "were virtually ill prepared" to receive Ukrainian refugees.

"People are forced to leave their cars and walk on foot carrying their heavy bags. Lines are up to 40 kilometers long, and the crossing time is over two days," Mizintsev said.

U.S. Secretary of State Antony Blinken crossed the border into Ukraine Saturday after meeting with Ukrainian Foreign Minister Dmytro Kuleba at the Korczowa Border Crossing Point.

"The entire world stand with Ukraine," Blinken said, and Kuleba added that he hopes Ukrainians will see this as a "clear manifestation that we have friends who literally stand by us."

Blinken said the sanctions imposed so far against Russia are "producing very, very concrete results" and that the pressure will "grow" until this "war of choice is brought to an end."

When asked directly about helping Kuleba with more firepower, Blinken said, "the support for Ukraine not only has been unprecedented, not only is going to continue, it's going to increase."

Kuleba said Ukraine "appreciates" sanctions that have been announced in the last week, but that more economic and political pressure and "necessary weapons," would "save many lives in Ukraine... many sufferings will be avoided."

Kuleba also said that they are “satisfied" with already arranged supplies of anti-tank weapons and ammunition, but that “it’s no secret” they still want fighter jets and air defense systems.

He also thanked the U.S. for sending stingers, and said they were used on Saturday.

"Just today we shot down three Russian attack aircrafts, which were bombing our cities with the use of stingers but we need -- so to say -- big air defense systems to ensure the safety of our skies. If we lose the skies, there will be much, much more blood on the ground,"Kuleba said.

In response to questions about NATO’s refusal to impose a no-fly zone over Ukraine, Kuleba said it’s a "sign of weakness," but stayed optimistic that they will change their minds.

"The time will come," he said.

-ABC News' Conor Finnegan and Justin Gomez