"I am super pro Ukraine, but relentless escalation is very risky for Ukraine and the world," Musk said via Twitter on Friday.
Musk's comment came in response to South African-American entrepreneur David Sacks, who re-tweeted an article "US Warms to Helping Ukraine Target Crimea." Sacks commented on Twitter that the reported development in Washington seems "insanely risky."
In October, Musk proposed a peace plan to end the conflict in Ukraine, but his proposal drew condemnation from US and Ukrainian officials, including President Volodymyr Zelensky.
Musk's peace plan would guarantee that Russia controls Crimea and there would be a continued water supply to the peninsula. The proposal also called for United Nations-monitored referenda in the four regions that recently voted to join the Russian Federation.
In addition, Musk published two polls asking the public their opinion about a peace deal between Ukraine and Russia and about the status of the Donbas and Crimea. Ukrainian officials, including Zelensky, criticized the polls and published a poll asking the public whether Musk supports Ukraine or Russia. In November, Zelensky invited Musk to come to Ukraine and see the situation in the country first-hand.