Ukraine's defense ministry said it found 132 "tormented bodies" of tortured, murdered citizens in the town of Makariv, after Russian forces retreated.

The ministry said it uncovered "new monstrous war crimes," saying the town is "half ruined."

-ABC News' Mike Trew

The Russian defense ministry claimed it fired on the Ukrainian Apache, a dry-cargo ship, which allegedly changed course and attempted to break through to the Mariupol seaport, the ministry said.

The Ukrainian dry-cargo ship did not respond to Russian border guards' demands to contact them through the international channel and continued heading in the direction of Mariupol port, Russia claimed.

Russia said two border patrol ships fired warning artillery along the vessel's course, but the cargo ship did not change course or slow down.

The cargo ship, over radio communication, transmitted a message, saying, "I am 'Maniac', coming for you," and signal fires were observed on the shore, according to Russia's defense ministry.

The Black Sea Fleet then opened artillery fire on the Apache dry-cargo ship to block the vessel, Russia's defense ministry said.

A direct hit caused a fire in the stern of the ship and it then went adrift. The crew got in touch with border ships with a request to cease fire and said they will comply with the demands of Russian sailors, Russia said.

Russia said no crew members were injured and the fire was extinguished by the ship's crew.

The ship was inspected and then convoyed to the Yeysk port along with its crew, according to Russia.

British Prime Minister Boris Johnson met with Ukrainian President Volodymyr Zelenskyy in Kyiv on Saturday, according to the Ukrainian Embassy in London.

"The Prime Minister of the United Kingdom Boris Johnson is one of the most principled opponents of the Russian invasion, a leader in sanctions pressure on Russia and defence support for Ukraine. Congratulations in Kyiv, my friend!" Zelenskyy said in a post online.

Britain announced it will send 120 armored vehicles and new anti-ship missile systems to support Ukraine, according to the The Associated Press.

"Today I met my friend President @ZelenskyyUa in Kyiv as a show of our unwavering support for the people of Ukraine. We're setting out a new package of financial & military aid which is a testament of our commitment to his country's struggle against Russia’s barbaric campaign," Johnson said.

Ukraine claimed Saturday that its intelligence indicates Russian forces are currently regrouping in eastern Ukraine, then the tankers intend to move toward Kharkiv, Ukraine's Defense Intelligence Chief Kyrylo Budanov said.

Russians are also regrouping in the direction of Izum, in the Kharkiv region, the Ukrainians said.

"They plan to enter Kharkiv in the first place. They will try to conquer the city of Mariupol and only after that they can try to initiate Kiev," Budanov said in an interview on CNN.

To compensate for their significant losses in Ukraine, the Russian army is transferring additional troops to Belgorod (Russia), from where they are relocated to Kharkiv region, the Ukrainians claimed.

Budanov said Ukraine needs serious military support from allies so its soldiers can more effectively resist Russian aggression.

-ABC News' Mike Trew

President Joe Biden on Thursday announced a new $800 million security assistance package to help Ukrainians fighting in the eastern Donbas region. This funding includes heavy artillery weapons, tactical drones and howitzers.

This package includes 72 new howitzers. Combined with the 18 howitzers announced last week, the 90 howitzers headed to Ukraine can equip five battalions, according to the administration.

Biden noted that he’s run out of pre-approved money and equipment to send to Ukraine and he appealed to Congress to approve more.

When pressed by ABC News on how long the U.S. can sustain this level of spending, Biden said, “We have the capacity to do this for a long time."

He went on, "The question is, are we going to continue to maintain the support of the international community? And keep the pressure on Putin to prevent him from overrunning the country, No. 1, and No. 2, make sure we continue to maintain the economic sanctions, which, over time, and we're beginning to see, they’re devastating their economy and their ability to move forward."

Biden also announced a separate $500 million in economic aid to Ukraine to help fund government operations like salaries, pensions and social programs.

The president added that the U.S. is now banning Russian-affiliated ships from American ports.

Biden met with Ukrainian Prime Minister Denys Shmyhal Thursday morning ahead of his remarks.

-ABC News' Luis Martinez and Sarah Kolinovsky