KYIV, Ukraine (AP) — Russia has launched a fresh drone assault on Ukraine after promising that strikes on the Russian border city of Belgorod “would not go unpunished”. The Ukrainian Air Force said Sunday that it had shot down 21 of 49 drones launched by Russian forces overnight. Twenty-eight people were wounded in the attack on the eastern city of Kharkiv, regional Gov. Oleh Syniehubov said Sunday. The attacks came after shelling in the Russian city of Belgorod Saturday killed 24 people. A further 108 people were wounded, regional governor Vyacheslav Gladkov said Sunday, making it one of the deadliest attacks on Russian soil since the start of Moscow’s invasion of Ukraine 22 months ago.