The U.S. Department of Defense announced $400 million in new military aid for Ukraine, including eight folding armored bridges for the first time.

This is the Biden administration's 33rd drawdown of equipment from Department of Defense inventories for Ukraine.

-ABC News' Luis Martinez

Around 5,000 people still remain in the Ukrainian city of Bakhmut, including 37 children, according to Donetsk Oblast Regional Governor Pavlo Kyrylenko.

The losses in Bakhmut stand at the rate of one Ukrainian solider to seven Russian soldiers, Secretary of the National Security and Defense Council Oleksii Danilo said on TV.

Russian forces fighting for control of Bakhmut intensified shelling at access roads to the west, making it harder for Ukrainian forces to move in and out, Reuters reported Friday.

-ABC News' Yulia Drozd

The State Department said Friday that Secretary of State Antony Blinken spoke with Ukrainian Foreign Minister Dmytro Kuleba about the brief conversation that took place at the G-20 summit between Blinken and Russian Foreign Minister Sergei Lavrov.

"The Secretary underscored to Foreign Minister Kuleba the United States’ enduring support for Ukraine as it defends itself against Russia’s brutal attacks, including the ongoing targeting of civilian infrastructure and resulting civilian casualties," State Department spokesman Ned Price said in a statement.

-ABC News' Shannon Crawford

The U.S. will announce another assistance package for Ukraine on Friday, White House spokesperson John Kirby announced Thursday afternoon, but did not detail the exact size of this next round of support.

"You'll see us tomorrow, just unilaterally, the U.S. will have another round of assistance for Ukraine coming tomorrow. And it will include mostly ammunitions and munitions that the Ukrainians will need for the systems that they already have, like the HIMARS and the artillery."

The new aid comes as President Joe Biden meets with German Chancellor Olaf Scholz at the White House Friday to discuss ongoing support for Ukraine as Russia's invasion continues.

Kirby said the leaders would discuss the "kinds of capabilities that Ukraine continues to need in the weeks and months ahead."

He also said this will be a "true working visit" between Biden and Scholz and they are expected to discuss "recent engagements with Ukrainian officials, including the President's trip to Kyiv and meeting with President Zelenskyy, as well as Chancellor Schultz’s meeting with President Zelensky in Paris last month."

-ABC News' Justin Gomez

The Russian oligarch behind the Wagner private paramilitary group fighting for the Kremlin in Ukraine is threatening a mutiny if his forces are not resupplied with ammunition soon.

Yevgeny Prigozhin, owner and curator of the Wagner group, penned a letter to Russian Defense Minister Sergei Shoigue, demanding ammunition be provided to his forces on the battlefield.

In the letter, Prigozhin wrote that if supply problems are not fixed fast, he will complain to Russian President Vladimir Putin and his mercenaries would abandon their positions in Bakhmut, Ukraine, where heavy fighting has been going on for weeks, The Moscow Times reported.

“I appeal to Shoigu with a request to immediately issue ammunition. In case of refusal, I consider it necessary to convey to the Supreme Commander-in-Chief information about the existing problem in order to make a decision and about the advisability of further presence of Wagner PMC in Bakhmut in the conditions of a shortage of ammunition," Prigozhin wrote.

He added, "If the deficit is not replenished ... we will be forced to withdraw part of the units from this territory, and then everything else will crumble. Therefore, the bell is already ringing -- it is called an alarm."

Emphasizing the urgency, Prigozhin noted that Ukraine is planning to launch a counteroffensive soon.

There was no immediate public response from Shoigu or the Kremlin.

"We need to stop deceiving the population and telling that everything is fine with us," Prigozhin wrote. "I must honestly say: Russia is on the brink of disaster. If these screws are not adjusted today, the 'aircraft' will crumble in the air."