The videos show Ukrainian shelling of Russian troops in the town of Dvorichne, which was until recently in Ukrainian hands. 4:24 p. ET, February 7, 2023Fierce fighting reported on outskirts of the eastern city of BakhmutFrom CNN's Tim Lister and Kostan NechyporenkoThe Ukrainian military says there has been heavy fighting across several areas of the eastern frontlines, as well as renewed Russian shelling in the south of the country. Unofficial social media accounts on both sides of the conflict have confirmed bitter fighting around the eastern city of Bakhmut, as Russian forces step up efforts to encircle and capture the city. The Ukrainian General Staff said that over the past 24 hours, more than 30 settlements in the Donetsk, Kharkiv and Luhansk regions came under fire. It also listed several districts and villages around Bakhmut as coming under attack.

Here are more developments:Military assistance. Ukraine's top national security official told CNN he's confident Ukraine will eventually receive American-made F-16 fighter jets, saying that "it's only a matter of time. " And Leopard 2 battle tanks from Germany will be ready for Ukraine to use at the end of March, according to a tweet from the German army. Ukrainian Minister of Defense Oleksii Reznikov thanked Germany's pledge to send the tanks.

Ukrainian officials reported at least six explosions in Kharkiv on Tuesday. And over the past 24 hours, more than 30 settlements in the Donetsk, Kharkiv and Luhansk regions came under fire, with several districts and villages around Bakhmut coming under attack as well, the Ukrainian General Staff said. The Defense Intelligence of Ukraine on Tuesday dismissed Russia's claims that it has taken control of several small settlements in the Donetsk and Zaporizhzhia regions. Also, Russian forces in eastern Ukraine appear to be stockpiling ammunition and building up troop reserves ahead of an offensive that could begin in weeks, Ukraine’s top official in the Luhansk region said. Meanwhile, Ukraine's top national security official, Oleksiy Danilov, hinted at Kyiv's ability to strike Russia on its own territory, beyond occupied Ukraine. Leadership changes.

"Earlier on Tuesday, Russian Defense Minister Sergei Shoigu said Russia's "operations are successfully developing" near the key towns of Bakhmut and Vuhledar, and that Russian forces have taken control of several small settlements in the Donetsk and Zaporizhzhia regions. CNN is unable to independently verify those claims. Shoigu also said Russia has full control of Soledar, which the Ukrainian Armed Forces already announced their withdrawal from in January. The Defense Intelligence of Ukraine also criticized Shoigu for touting the "achievements" of the Russian Armed Forces, arguing that the Russian private military contractor Wagner is actively involved in combat in those areas.