Russian forces are continuing their attempted push through Ukraine from multiple directions, while Ukrainians, led by President Volodymr Zelenskyy, are putting up "stiff resistance," according to U.S. officials.
The attack began Feb. 24 as Russian President Vladimir Putin announced a "special military operation."
Russians moving from Belarus towards Ukraine's capital, Kyiv, don't appear to have advanced closer towards the city since coming within about 20 miles, although smaller advanced groups have been fighting gun battles with Ukrainian forces inside the capital since at least Friday.
Russia has been met by sanctions from the U.S., Canada and countries throughout Europe, targeting Russia's economy and Putin himself.
Here's how the news is developing. All times Eastern.
Feb 15, 2022, 8:09 PM EST
Russian troops moved to firing positions near Ukraine, sources say
As Russia's defense ministry said Tuesday that some forces would pull back from Ukraine's borders after completing military exercises, sources told ABC News that there are troops moving forward closer to the line, including with medical supplies, and being put into firing positions.
The U.S. believes that Russia now has all the necessary pieces in place, including 150,000 troops in the region, to launch a swift and brutal invasion of Ukraine, the sources added -- the reason why Biden administration officials have now publicly been saying Russia could move "at any time."
ABC News has learned that Russian leader Vladimir Putin had told his military forces to be ready to go by Wednesday, but it is still unclear whether he has made a decision to attack his neighbor.
In another attempt to signal Western unity, U.S. Secretary of State Antony Blinken held a call with his British, French and German counterparts after speaking with Russian Foreign Minister Sergey Lavrov Tuesday morning, the U.S. Department of State confirmed.
The four foreign ministers discussed their coordinated "implementation of the massive consequences and severe costs to be imposed if Russia invades Ukraine," Blinken spokesperson Ned Price said in a statement.
In addition, Blinken's deputy, Wendy Sherman, spoke with her British, French, German and Italian counterparts Tuesday, the State Department said.
-ABC News' Conor Finnegan
Feb 15, 2022, 5:40 PM EST
Senate leadership issues bipartisan statement in support of Ukraine
Following President Joe Biden's remarks Tuesday, Senate leaders released a bipartisan statement of support for Ukraine that included a stark warning for Russia.
In the event of an invasion in Ukraine, "Russia must be made to pay a severe price," said the statement, which was released by Senate Majority Leader Chuck Schumer and Senate Minority Leader Mitch McConnell, along with the leaders of several Senate committees.
Lawmakers would support "immediate imposition of strong, robust, and effective sanctions on Russia, as well as tough restrictions and controls on exports to Russia" in the event of an invasion, the statement said.
The senators noted that U.S. troops "stand ready" to enforce the security of Eastern allies and will "respond decisively to Russian efforts to undermine the security of the United States at home and abroad."
-ABC News' Allison Pecorin
Feb 15, 2022, 4:41 PM EST
Biden addresses American public on importance of Ukraine
President Joe Biden warned the American people that any conflict over Ukraine with Russia would not be "painless" at home either, particularly when it comes to energy prices, although he said his administration is taking active steps to try to prevent any disruption.
"To be clear, if Russia decides to invade, that would also have consequences here at home. But the American people understand that defending democracy and liberty is never without cost," Biden said. "I will not pretend this will be painless. There could be impact on our energy prices, so we're taking active steps to alleviate the pressure on our own energy markets and offset raising prices," he added.
The president went on to explain why he felt the situation justifies U.S. involvement, saying that "this is about more than just Russia and Ukraine."
President Joe Biden speaks about Ukraine in the East Room of the White House, Feb. 15, 2022, in Washington.
Alex Brandon/AP
"It's about standing for what we believe in, for the future that we want for our world, for liberty, for liberty, the right of countless countries to choose their own destiny. And the right of people to determine their own futures, or the principle that a country can't change its neighbor's borders by force," Biden said. "If we do not stand for freedom where it is at risk today, we'll surely pay a steeper price tomorrow."
Biden also reiterated his administration's call for all Americans to depart Ukraine "now -- before it's too late to leave safely," and speaking directly to the Russian people, said they were "not the enemy."
"I do not believe you want a bloody destructive war and Ukraine, a country and people with whom you share deep ties of family, history and culture," he said.
