Looks like a bunch of stock footage. Where are those totally snow covered mountains, and when?
Well, if it is “stock footage,” it has not been challenged by US/NATO/Western officials/experts nor by private defense experts in the MSM or elsewhere (to the best of my knowledge).
Given that it’s supposed to have a range of 2,000 miles or thereabouts, the missiles could have been launched from Russian territory. And you will find plenty of ice there.