Despite increased production of Su-35 and Su-57 fighters, Russia's Su-35 "Flanker-E" has struggled in Ukraine. Originally designed to rival American fourth-generation jets, the Su-35 boasts a range of missiles,

Amid reports that Pyongyang’s troops are on the front lines, speculation is rampant among Ukrainian troops about when the first large-scale clashes will happen.

Ukraine's top military commander, Oleksandr Syrskyi, said on Saturday that there were reports North Korean troops were preparing for combat alongside Russian forces. "We have numerous reports of North Korean soldiers preparing to participate in combat operations alongside Russian Forces,