Would that work?
I don’t consider this a real threat but whoever made it may not have any real idea what the outcome of a large nuclear blast in Yellowstone would have, it might not awaken the dormant supervolcano at all, therefore amounting to a first strike with no strategic value quickly followed by total destruction of Russia by sensibly targeted missiles.
“Would that work?”
Unlikely. The forces involved make a nuke look like a firecracker. But if it did work, it would be an extinction level event for the whole planet.