POKROVSK, Ukraine (AP) – Russian and Ukrainian troops are trading blows in fierce close-quarter combat in an eastern Ukraine city. Local officials reported Russian forces “storming” the eastern city of Sievierodonetsk on Sunday, a situation that the Ukrainian president described as “indescribably difficult.” Ukrainian President Volodymyr Zelenskyy says 90% of the buildings in Sievierodonetsk have been damaged. The city has emerged as an epicenter of Russia’s quest to conquer Ukraine’s industrial Donbas region. Russia also stepped up efforts to take nearby Lysychansk, where constant shelling was reported. Zelenskyy himself made a rare frontline visit to soldiers in Kharkiv. He declared “I feel boundless pride in our defenders. Every day, risking their lives, they fight for Ukraine’s freedom.”