More likely to help North Korea - birds of a feather...........
He wouldn't want america to be close to him
Not with the proxy war that's beginning in the middle east.
Russia would f**k us over at our weakest point, just to achieve world top domination with over 1.7k nukes. We'll all die, say goodbye to your dog bob, and your neighbors annoying cat jack frost.
At this point, everyone hates North Korea.
I think that Russia would either stay neutral, or support the U.S
I can see airstrikes being the biggest contributor to a campaign against N. Korea. Boots on ground would have to require an incentive for Russia, whether it be resources or like after WWII, a section of a newly carved N. Korea. Regardless, the effort to have a competing Russia as an ally could prove to do more damage to the U.S. in the long run, so in all which is more important to the American public, the short-term savings of lives and equipment or the long-term track of resources and possible puppet government for Russia to be held against Western interest.
North Korea used to be supported by Russia, but is now seen as a threat. North Korea has no relationship with Russia whatsoever anymore and doesn't intend to. They probably don't like each other, given North Korea's reputation.