There’s also this Ukrainian report on the matter but it’s in Ukrainian, so I’m sharing the Mastodon post in English.
4 points
The US has specific sanctions against Ramzan Kadyrov and if Musk violated any of them he could be prosecuted for sanctions violations.
That would be separate from a prosecution under “succor to the enemy”. As near as I can tell, that only comes into effect under the very specific case of declared wars and that sanctions alone, aren’t sufficient.