Ukrainian President Volodymyr Zelenskyy posted a new video from the capital, Kyiv, on Saturday morning, saying Ukrainians "won’t lay down weapons, we will defend our country.”

“Good morning everyone, Ukrainians! There are a lot of fakes circulating that I’m calling upon to lay down weapons and evacuation is under way. Here’s the situation. I’m here,” Zelenskyy said in the video, using his official residence as a background. “We won’t lay down weapons, we will defend our country. Because our weapon is our truth. The truth is that it’s our land, our country, our children. And we will defend all of it. This is it. This is what I wanted to tell you. Glory to Ukraine!”

Zelenskyy in a separate tweet said he spoke on Saturday to French President Emmanuel Macron, marking a “new day in the diplomatic frontline.”

“Weapons and equipment from our partners are on the way to Ukraine,” he said. “The anti-war coalition is working!”

-ABC News’ Katie den Daas and Julia Drozd

President Joe Biden authorized up to $350 million in additional security assistance “to provide immediate military assistance to Ukraine,” according to a memo released Friday night.

A White House official said this brings the total security assistance the U.S. has approved for Ukraine to $1 billion in the past year.

-ABC News’ Justin Gomez

Oksana Markarova, the Ukrainian ambassador to the United States, thanked President Joe Biden for support and said her country will not surrender to Vladimir Putin in an interview with ABC News Live Friday night.

"Even though for the past 48 hours we have been under brutal attack from the air, from east, from north, from everywhere, by the enemy, by a neighboring country that attacked a sovereign country ... we remain committed to defend our home," Markarova said. "We resist. We will not surrender our capital to the enemy."

Ukrainian President Volodymyr Zelenskyy said earlier in the evening local time that Russian forces were planning to "storm" the capital of Kyiv overnight. Fighting was already taking place in the northern suburbs of the city late Friday. Zelenskyy called for citizens to arm themselves and fight for the city.

"We actually admire every man and woman that today is defending our homes again," Markarova said. "Ukraine is a very peaceful country. We never attacked anyone. It was Ukraine that was attacked by Russia in 2014, when they illegally occupied Crimea, when they illegally occupied parts of Donetsk and Luhansk territory. ... We defended our choice to be not only sovereign, not only independent, but also European and democratic."

Markarova added, of the invasion, "We still didn't think that, again, in the 21st century, when we have all the cameras and information and transparency that they would actually authorize to start a war on a sovereign country and war in this most brutal way."

-ABC News' Penelope Lopez

Following the U.N. Security Council's vote Friday on the resolution to condemn Russia for its invasion of Ukraine, the ambassadors for Russia and Ukraine had harsh words for their U.N. counterparts.

In a fiery speech against the resolution, Russian envoy Vasily Nebenzya said countries were purposefully ignoring Ukraine's alleged crimes against people in its eastern Donbas region, denied Russian troops have bombed Ukrainian cities and accused Western media of using fake videos.

Nebenzya claimed the 11 countries that voted yes on the measure have "made Ukraine a pawn in your geopolitical game with no concern whatsoever about the interest of the Ukrainian people."

"Your draft resolution is nothing other than yet another brutal inhumane move in this Ukrainian chessboard," he added.

Ukraine's U.N. ambassador, Sergiy Kyslytsya, said he would not "dignify the Russian diabolical script that is rather a letter of obligation for an upscale seat in hell."

That was the first of many personal attacks on Nebenzya, whose words he said "have less value than a hole in a New York pretzel." He later added it must be "so painful to think what your family thinks about you when you lie every day."

Kyslytsya asked to hold a moment of silence for those killed so far in the conflict, adding, "I invite the Russian ambassador to pray for salvation."

When the moment began, the Russian envoy interrupted to add they should also pray for those killed in the Donbas -- repeating the baseless claim that the Ukrainian government is responsible for a genocide in the region.

Kyslytsya scolded the three countries that abstained and called on all of Ukraine's partners to break diplomatic relations with Russia -- something no one else has done yet.

Nebenzya then took a moment to dismiss Kyslytsya's "boorishness" before gaveling out the meeting.

And with that, a week of high-level diplomacy did nothing to change the war on the ground.

-ABC News' Conor Finnegan