Russia-Ukraine updates: Putin suspends key US-Russia nuclear treaty in speech denouncing West

Russian President Vladimir Putin on Friday vowed to press his attack on Ukraine, despite the latest counteroffensive with Ukraine claiming it regained control of almost 400 settlements, according to the the Associated Press.

Putin met with Turkish President Recep Tayyip Erdogan in Samarkand, Uzbekistan Friday, on the sidelines of a security alliance summit, to discuss economic cooperation and regional issues, including the agreement allowing Ukrainian grain exports to resume, which was brokered by Turkey and the United Nations, according to the AP.

Putin told reporters the "liberation" of Ukraine's entire eastern Donbas region remained Russia's main military goal and that he sees no need to revise it, saying "we aren't in a rush," according to the AP.

Asked about the Ukrainian counteroffensive, Putin said, "Let’s how it develops and how it ends," according to the AP.

A "mass burial" site was discovered in Izyum, a city in the Kharkiv region, after it was liberated from Russian control, Ukrainian President Volodymyr Zelenskyy said during his nightly address Thursday.

"Necessary procedural actions have already started there. There will be more clear verified information tomorrow," he said.

"We want the world to know what is really happening and what the Russian occupation has led to. Bucha, Mariupol and now, unfortunately, Izyum," he continued.

A senior Kharkiv police official told ABC News that a mass grave with more than 400 bodies was found on the outskirts of Izyum.

-ABC News' Jason Volack and Dragana Jovanovic

Evacuations are underway in two districts in the Ukrainian town of Kryvyi Rih after Russia struck a nearby dam with eight cruise missiles.

The strikes badly damaged the dam and a nearby pumping station, releasing huge amounts of water into the Inhulets River and causing it to swell and break its banks. Streets and homes were flooded and two bridges were swept away.

Kryvyi Rih is the hometown of Ukrainian President Volodymyr Zelenskyy. About 650,000 people live there.

"Your missile attacks today, Russian missiles targeting Kryvyi Rih, the dam of the Karachunivske Reservoir, the objects that have no military value at all, in fact hitting hundreds of thousands of ordinary civilians, is another reason why Russia will lose. And not just this war, but history itself," Zelenskyy said in his evening address Wednesday.

-ABC News' Tomek Rolski

Ukrainian forces advanced 110 kilometers (roughly 68 miles) in five days of fighting, taking control of 19 kilometers (roughly 12 miles) in the first day of fighting alone, Ukrainian President Volodymyr Zelenskyy said in his evening address on Wednesday.

Ukraine's forces regained control of almost 400 settlements and freed 150,000 Ukrainians, according to Zelenskyy.

"Ukrainians once again managed to do what many considered impossible," Zelenskyy said.

Zelenskyy also told viewers to expect diplomatic news Thursday.

-ABC News' Jason Volack