Ukraine claimed Thursday to have raised its flag over the town of Bucha, close to the Ukrainian capital where some of the most intense fighting has been taking place in recent days and where Russia's push south on Kyiv appears to have stalled.

A video posted on the official Facebook page of the Ukrainian Armed Forces' ground troops purportedly shows soldiers hoisting the national flag outside Bucha's town hall. The town is just a few miles north of the edge of Kyiv and about 15 miles from the center of the capital. Fighting is reported to be ongoing nearby and, in the video, an explosion can be heard in the distance as they raise the blue and yellow flag.

-ABC News' Yulia Drozd

Ukraine is asking the International Atomic Energy Agency (IAEA) to call on NATO to close access to the airspace over the country's Chernobyl nuclear power plant and the surrounding exclusion zone.

The deserted exclusion zone around the Chernobyl nuclear power plant, where the world's worst nuclear accident took place in 1986, was seized by Russian forces last week.

A joint appeal to the IAEA was signed Wednesday by Ukrainian Energy Minister Herman Galushchenko, Oleh Korikov, head of the State Nuclear Regulatory Inspectorate of Ukraine, and Petro Kotin, head of Ukraine's state nuclear energy company Energoatom.

"The fact of the seizure of the world-famous Chernobyl nuclear power plant has all the hallmarks of an act of nuclear terrorism committed against Chernobyl nuclear facilities and its personnel by Russian military units," they said in the appeal.

-ABC News' Yulia Drozd

Russia claimed Thursday that its forces have "disabled" another television tower in Ukraine's capital.

Russian troops fired precision-guided weapons at a TV and radio center in the Lysa Hora region of Kyiv, according to Russian Ministry of Defense spokesman Igor Konashenkov.

"A strike delivered by a long-range precision-guided weapon disabled a reserve TV and radio center in the Lysa Hora area in Kyiv which the Ukrainian Security Service has been using for psychological operations against Russia," Konashenkov said at a press briefing Thursday. "There are no casualties and there is no damage done to residential buildings."

There were reports of more explosions in Kyiv on Thursday morning, but Ukrainian officials have yet to confirm that a second TV tower was hit.

A Russian missile struck Kyiv's main TV tower in the heart of the capital on Tuesday.

Ukrainian Defence Minister Oleksii Reznikov has said that Russia is aiming to cut off a large part of Ukraine from the internet and communications.

-ABC News' Tanya Stukalova

Russia claimed Thursday that its forces have seized the eastern Ukrainian city of Balakliya.

Russian troops worked together with Russia-backed separatist forces on the "successful offensive," according to Russian Ministry of Defense spokesman Igor Konashenkov.

"The city of Balakliya has been freed from nationalist battalions," Konashenkov said at a press briefing Thursday.

Balakliya is about 55 miles southeast of Kharkiv, Ukraine's second-largest city, where heavy shelling continued Thursday.

-ABC News' Tanya Stukalova

Russia's Foreign Ministry claimed U.S. military intelligence launched a massive campaign to recruit contractors from private military companies to send to Ukraine.

"They recruit primarily those employed by Academi, CUBIC and DynCorp [International]," Russian Defense Ministry spokesperson Igor Konashenkov said in a press briefing on Thursday.

Foreign mercenaries who have arrived in Ukraine are performing acts of sabotage and attacking Russian convoys of motor vehicles and aviation, Konashenkov said.

"Foreign mercenaries who earlier arrived in Ukraine are carrying out acts of sabotage and raids on Russian convoys of [military] vehicles and materiel supplies, and on the aviation supporting them," Konashenkov said.

Konashenkov claimed Britain, Denmark, Latvia, Poland and Croatia have legally permitted their citizens to take part in Ukraine hostilities and that the command of the French Foreign Legion plans to send its ethnic Ukrainian troops to aid the Kyiv regime.

Mercenaries from other countries in Ukraine will not receive prisoner-of-war status and will be subject to criminal liability, Konashenkov said.

"I want to officially emphasize that all mercenaries sent by the West to help the Kyiv nationalist regime are not combatants under international humanitarian law. They are not entitled to POW status," Konashenkov said.

Russia said it hopes its current talks with Ukraine on Belarusian soil will soon lead to a peaceful settlement, Russian Foreign Ministry spokesperson Maria Zakharova said.

"We hope the [talks] will lead to a swift conclusion of this situation, the restoration of peace in Donbas, and the return of all peoples of Ukraine to a peaceful and equitable life," she told a briefing in Moscow on Thursday.

- ABC News' Tanya Stukalova