The European Council extended sanctions against Russia to include 26 more individuals and an additional entity, the Council said in a statement Monday.

The new listings include oligarchs and businessmen active in the oil, banking and finance sectors as well as government members, high-level military personalities and propagandists who contributed to the spread of anti-Ukrainian propaganda and promoted a positive attitude toward the invasion of Ukraine.

Some prominent individuals on the list include Igor Sechin, CEO of Rosneft, a Russian state oil company; Nikolay Tokarev, CEO of Transeft, a major Russian oil and gas company; Alisher Usmanov, a pro-Kremlin oligarch with close ties to Russian President Vladimir Putin; and Petr Aven, one of Putin's closest oligarchs.

The EU’s restrictive measures now apply to a total of 680 individuals and 53 entities.

-ABC News' Christine Theodorou

The White House is not ruling out imposing restrictions on importing Russian oil and gas, White House press secretary Jen Psaki said in a briefing Monday afternoon.

"We haven't ruled out that," she said.

The sanctions announced this past week by the Biden administration did not directly hit oil and gas flows from Russia, which would deal a major blow to the energy market as the global economy continues to recover.

The White House has raised concerns about already high energy costs for Americans going even higher if this trigger is pulled.

Remaining "on the table" as well is the option to tap into the strategic petroleum reserve, though Psaki didn't have updates on that decision.

"There are conversations that we've been having with global partners, and obviously we have our own strategic petroleum reserve stockpile to tap into," she said.

When asked about Canadian Prime Minister Justin Trudeau's announcement that Canada would unilaterally ban Russian crude oil imports and whether the U.S. would make a similar move without coordination from European partners, Psaki repeated that "all options remain on the table."

"You have seen us take a number of actions over the last several days that play that out," she said. "But I don't have anything to predict at this point other than to reiterate that we have really worked to take steps in lockstep with the Europeans and a number of our NATO partners."

Psaki said the White House also continues to be in touch with Saudi Arabia to try and minimize the impact on energy markets across the world as the Russian invasion of Ukraine continues.

She would not say if the U.S. made any request to Saudi Arabia or OPEC+ members to increase production given the ongoing crisis.

"There is an ongoing discussion about steps that we can take to address volatility in the market," Psaki said.

-ABC News' Justin Gomez

The International Criminal Court is "opening an investigation into the situation in Ukraine, as rapidly as possible," the court's chief prosecutor, Karim A.A. Khan, announced Monday.

The court has "reasonable basis to believe" that war crimes and crimes against humanity were committed in Ukraine and is pursuing accountability, including possible prosecutions, Khan said in a statement.

An authorization from a pretrial chamber of the court and support and funding from the ICC's 123 member states will be required to begin an investigation.

Neither Russia nor Ukraine is a member of the court, but Ukraine has provided authorization for an investigation in its territory, Khan said.

The U.N. Human Rights Council also voted Monday to hold an urgent debate on Thursday, where they'll consider a draft resolution from Ukraine.

-ABC News' Conor Finnegan

Americans people should not be worried about the threat of nuclear war, President Joe Biden said Monday.

The president made the comment while leaving a White House event celebrating Black History Month, replying “No” when a reporter asked whether the country should feel worried.

The brief response to the question was Biden's only reference to the current situation in Ukraine, but Vice President Kamala Harris commented further on the situation unfolding in Eastern Europe.

"Today the eyes of the world are on Ukraine, and the brave people who are fighting to protect their country and their democracy," Harris said. "And their bravery is a reminder, a most recent reminder that justice, equality, and freedom must never be taken for granted by any of us."

On a call with allies Monday afternoon, Biden discussed "their coordinated efforts to impose severe costs and consequences to hold Russia accountable while working to maintain global economic stability, including with regard to energy prices,” according to a statement from the White House.

The U.S. sees "no reason" to change its own nuclear alert level, White House press secretary Jen Psaki said in a press briefing Monday afternoon.

“We are assessing Putin's directive and at this time we see no reason to change our own alert level,” she said.

-ABC News' Mary Bruce and Molly Nagle

Secretary of State Antony Blinken closed his remarks to the U.N. Security Council meeting by challenging the Russian Federation to "announce today -- with no qualification of equivocation or deflection -- that Russia will not invade Ukraine, stated clearly stated plainly, to the world."

"And then demonstrate it by sending your troops, your tanks, your planes back to their various can hangars and sending your diplomats to the negotiating table," he added.

Blinken laid out how the U.S. believes Russia will attack Ukraine -- but said he would welcome being wrong and for Russia to withdraw.

"Now, I'm mindful that some have called into question our information, recalling previous instances where intelligence ultimately did not bear out," he said, apparently referring to a similar address then-Secretary of State Colin Powell famously made to the Security Council presenting U.S. intelligence to justify the Iraq War. "But let me be clear, I am here today not to start a war, but to prevent one," he said, citing allies that agree with U.S. assessments.

"If Russia doesn't invade Ukraine, then we will be relieved that Russia changed course and proved our predictions wrong. That would be a far better outcome in the course we're currently on. And we'll gladly accept any criticism that anyone directs at us," Blinken said.

He continued, "Russia can still make if there's any truth to his claim that is committed to diplomacy. Diplomacy is the only responsible way to resolve this crisis"

Blinken also said that he sent a letter to Russia's Foreign Minister Sergei Lavrov earlier Thursday proposing that they meet next week in Europe following their talks in recent weeks "to discuss the steps that we can take to resolve this crisis without conflict" and that U.S. is also proposing meetings at the NATO Russia Council and the OSC Permanent Council.

"These meetings can pave the way for a summit with key leaders in the context of de-escalation to reach understandings on our mutual security concerns," he added.