"Their accuracy, in principle, is not very high. We understand that the technologies by which they were manufactured are outdated," Andrii Cherniak, a military intelligence spokesperson, told Radio Free Europe/Radio Liberty.

Russia is treating North Korean troops well right now, Ukraine's Zelenskyy said, as it wants more to come fight, but they will become "cannon fodder."

Pyongyang will "invariably support" Moscow, North Korea's supreme leader, Kim Jong-un, told a visiting Russian delegation last week.