“Compromise is the most likely outcome, but the question is how much death and destruction will happen before then,” he wrote on Twitter.
Musk has previously said that he is trying to achieve a de-escalation of the situation in Ukraine, but so far without success.
According to him, people living in eastern Ukraine prefer Russia.
He also offered his own version of the settlement of the conflict around Ukraine.
Crimea became a Russian region after a referendum held there in March 2014: the majority of residents voted for reunification with Russia.