It kind of depends on which publication or news source you read. I know that the Russians have been supplying NK the technology for missiles from the middle range to the first ICBM since the early 80’s. The engines in the Hwasong-12, Hwasong-14 and Hwansong-15, which proved North Korea could now land a nuclear-armed missile on mainland USA, are close copies of a Soviet-era RD-250 powerplant which sources claim were supplied by Vladimir Putin.
And North Koreas unprecedented leap from primitive Scud-like rockets to full-on space-capable Intercontinental Ballistic Missiles, in just two years, has led further experts to conclude that the technology MUST have been smuggled in. And Moscow was known to have supplied technology for the regimes dated Scud missiles in the 1980s and 1990s. They supply anyone detriment to the US situations, the latest Syria.
rwood