Biden will announce the news in his State of the Union address, a source said.
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.
An overnight curfew will be imposed in Kyiv, Mayor Vitali Klitschko said. Residents must stay home between 10 p.m. and 7 a.m., with only workers involved in critical infrastructure and services allowed out.
Kyiv’s metro is also now being used as a bomb shelter.
-ABC News' Patrick Reevell
President Joe Biden is scheduled to speak at 12:30 p.m. ET, when he's expected to announce new sanctions against Russia, the White House said.
-ABC News' Mary Bruce
Ukraine's deputy interior minister, Anton Gerashchenko, warned on Thursday afternoon that Russian and Belarusian troops have entered the deserted exclusion zone around the Chernobyl power plant, the site of the world's worst nuclear accident, located about 60 miles north of the Ukrainian capital, Kyiv.
In a statement posted on his official Facebook page, Gerashchenko said Ukrainian forces are putting up an intense resistance. The Chernobyl Exclusion Zone begins almost immediately below Ukraine's border with Belarus.
Gerashchenko expressed concerns that artillery could hit the reactor if fighting were to approach it, causing radioactive nuclear dust to spread over the region.
Ukrainian President Volodymyr Zelenskyy said Russian forces "are trying to seize" the Chernobyl Exclusion Zone.
"Our defenders are giving their lives so that the tragedy of 1986 will not be repeated," Zelenskyy said in a post on his official Twitter account Thursday. "This is a declaration of war against the whole of Europe."
-ABC News' Patrick Reevell
Russian airstrikes have destroyed 74 ground targets belonging to the Ukrainian military thus far, including 11 airfields, three command centers and a naval base, Russian Ministry of Defense spokesperson Igor Konashenkov said Thursday.
Some 18 radio-locating stations for anti-aircraft missile systems were also destroyed, according to Konashenkov.
However, Konashenkov noted that the strikes are not being carried out against social facilities at Ukrainian military garrisons, such as homes, residential buildings and barracks, in order to avoid casualties among servicemen and their families.
Meanwhile, he said a Russian assault aircraft crashed due to a "pilot error" in eastern Ukraine's Donbas region.
"The pilot safely ejected and is at his military garrison now," Konashenkov added.
Pro-Russian separatist militias in Donbas continue a counteroffensive on the Ukrainian Armed Forces with fire support from the Russian army, according to Konashenkov.
-ABC News' Tanya Stukalova
