Busses promised by Russia to evacuate people from Mariupol did not arrive on Saturday.

At least 200 Mariupol residents had gathered near the Port City shopping center to be evacuated to Zaporizhia, adviser to the mayor of Mariupol Petro Andryushchenko said on Facebook.

“Instead of the buses promised by the Russian side, the Russian military approached Mariupol residents and ordered them to go away because "there will be shelling now." In fact, with rough coercion, they dispersed people. The buses were not submitted for loading,” he wrote.

Despite the increased activity, Russian forces have made no major gains in the last 24 hours as Ukrainian counterattacks continue to hinder their efforts, according to the UK Ministry of Defense.

Russian air and maritime forces have not established control in either domain, owing to the effectiveness of Ukraine’s air and sea defense.

Despite their stated conquest of Mariupol, heavy fighting continues to take place frustrating Russian attempts to capture the city, further slowing their desired progress in the Donbas.

United Nations Secretary-General Antonio Guterres will meet with Ukrainian President Volodymyr Zelenskyy and Foreign Minister Dmytro Kuleba in Kyiv on April 28.

Guterres will also meet with staff of U.N. agencies to discuss scaling up humanitarian assistance to the people of Ukraine.

The Russian Defense Ministry announced that one servicemember died and another 27 crew members went missing from its Black Sea Fleet flagship vessel Moskva last week.

"The remaining 396 crew members were evacuated from the cruiser to the ships of the Black Sea Fleet," the defense ministry said Friday.

The warship sank on April 14 following what the Ukrainians claimed was a missile attack. Russia did not acknowledge an attack on the ship and continued to say a fire broke out after ammunition detonated.

The defense ministry's latest announcement contradicts its earlier statement that all Moskva crew members had been rescued.

-ABC News' Somayeh Malekian

White House national security advisor Jake Sullivan hinted Thursday of more sanctions coming against Russia in the "next week or two" aimed at targeting ways Moscow is evading sanctions already imposed.

“Where our focus will be over the course of the coming days is on evasion,” Sullivan said Thursday at the Economic Club of Washington. “As Russia tries to adjust to the fact that it’s under this massive economic pressure, what steps do they take to try to evade our sanctions and how do we crack down on that? And I think we'll have some announcements in the next week or two that identify targets that are trying to facilitate that evasion both inside Russia and beyond."

When Sullivan was asked whether sanctions will automatically be lifted if a negotiated peace deal between Russia and Ukraine is worked out, he appeared cautious with his words, saying, “a lot of that depends on what the shape and scope” of the agreement is.

“A lot of it depends on what the Ukrainians, in consultation with us and the Europeans come to agree to," Sullivan said. "You know, we're not going to do a deal over the head of the Ukrainians where we give a bunch of sanctions relief to Russia. But if some measure of sanctions relief were built in to some credible diplomatic solution led by the Ukrainians, that's something that we would happily discuss."

But Sullivan said Russian oligarchs shouldn't expect to ever get back their yachts and other assets seized under sanctions that have been imposed, saying the ultimate goal is "not to give them back” once the war is over.

“The president is actively looking at how we can deal with the fact that as we seize these assets, our goal is not to give them back. Our goal is to put them to a better use than that," Sullivan said. "But I'll be careful in what I say today because there's an ongoing kind of policy process around how we end up dealing with that question. But, rest assured, that the goal is not just to sit on them for a while."

-ABC News' Justin Gomez