That is more recent and is just him trolling Rogozin (head of Roscosmos) which he's been doing for many years. Rogozin has attacked Musk personally for many years as well. From 2014: https://www.nbcnews.com/storyline/ukraine-crisis/trampoline-...

The only thing specifically related to Ukraine was Ukraine (specifically their minister of digital transformation) reaching out to Musk via twitter.