Biden Announces U.S. to Ban Russian Oil Imports

President Biden took aim at Russian President Vladimir Putin's main revenue source on Tuesday by announcing a U.S. ban on Russian oil and gas imports over the country's invasion of Ukraine.

The announcement came as the worst refugee crisis Europe has seen since World War II deepened, with more than 2 million people fleeing Ukraine in recent days into neighboring countries, according to the United Nations.

Russian forces are now surrounding key cities and inching — apparently more slowly than they'd hoped — toward the Ukrainian capital, Kyiv. Ukraine's defense forces are mounting a fierce resistance, CBS News senior foreign correspondent Charlie D'Agata reports.

Reports from battered Ukrainian cities suggested that Moscow is at least partially upholding its latest promise to allow civilians to flee from its seemingly indiscriminate artillery barrage. But while a truce in the northeast Ukrainian city of Sumy appeared to be holding, some people never got the chance to flee. At least 20 people were killed in one strike on the city alone Monday evening, local officials said.

Evacuations from at least one other surrounded city were quickly marred by alleged cease-fire violations.

At least three previous cease-fires collapsed, with Ukraine and Russia accusing each other of breaking the truces. Ukrainian officials said Tuesday that Russia had attacked a "humanitarian corridor" out of the southern port city of Mariupol.

Americans support by a 71% to 22% margin a ban on Russian oil, even if it means higher gasoline prices in the United States, according to the latest Quinnipiac University national poll.

Democrats back the ban by an 82% to 12% margin, while Independents (70% to 22%), and Republicans (66% to 30%) also support it by a considerable amount.

Other results from the survey include:

Regarding the steps that the Biden administration has taken so far to punish Russia for the invasion of Ukraine, 56% say they are not tough enough, 30% say they are about right, and 3% say they are too tough, results that are largely unchanged from last week's poll.
Concerning Biden's handling of the response to Russia's invasion of Ukraine, 42% approved and 45% disapproved, with 13% not offering an opinion. This compares to a week ago when 39% approved and 47% disapproved.
Biden receives a negative 38% to 51% job approval rating, with 11% not offering an opinion. This compares to a negative 37% to 52% job approval rating a week ago.
If Russian President Vladimir Putin goes beyond Ukraine and attacks a NATO country, 79% support a U.S. military response, with 14% opposed.
When asked if Putin is willing to use nuclear weapons against NATO countries, 60% said yes and 28% said the Russian leader was not willing to do so.
Forty-four percent expect the war to last months, 23% said it will go on for years, 19% weeks and 14% did not offer an opinion.
The poll was conducted among 1,374 U.S. adults nationwide between March 4-6, with a margin of error of +/- 2.6 percentage points.