Mayor: Russian troops hit administrative building in the center of Kharkiv.

Polish Prime Minister Donald Tusk is expected to later hold talks with President Volodymyr Zelensky.

"The enemy at the front doesn't have a problem, the enemy has a catastrophe," Serhiy "Flash" Bezkrestnov said.

Ukraine has brought back home 157 Ukrainians from Russian captivity in its latest exchange with Moscow, following an agreement reached during the latest round of peace talks in Abu Dhabi, President Volodymyr Zelensky announced on Feb. 5.

"They discussed everything (during the negotiations). The delegation believes the information is very sensitive, so they want to come (to Ukraine) to share the details," President Volodymyr Zelensky told reporters in Kyiv.

Following the first phase, the Pentagon says it will order $150 million in prototypes from successful competitors.

The General Staff attributed the strikes to "using long-range strike weapons of Ukrainian production, particularly the FP-5 'Flamingo.'"

Russia's flagship liquified natural gas (LNG) export terminal, Yamal LNG, exported a total of 1,690,517 metric tons of LNG to European markets last month, accounting for an 8% increase compared to January 2025, German environmental NGO Urgewald found in a report published Feb. 4.

Energy investments made up over 1.2 billion euros of the bank's financing to Ukraine last year, providing support for gas imports, decentralized generation, emergency repairs, as well as long-term reconstruction of the energy sector, the bank said.

After a short pause in attacks on Kyiv at the request of U.S. President Donald Trump, Russia has resumed attacks on the capital in recent days as residents continue to contend with freezing temperatures.

"The Russians are conducting a targeted attack on Zaporizhzhia and the region all day long. As a result of the attacks, over 53,000 subscribers...are without electricity," Governor Ivan Fedorov reported.

It would also cost Russia "800,000 more corpses" to take eastern Ukraine by force, President Volodymyr Zelensky told France TV in a Feb. 4 interview.