"Putin is a war criminal who should spend the rest of his life in prison, unless he is executed," he believes.
In response to a question about U.S. President Donald Trump's claim that he believes Putin wants peace, Wicker noted that Russians will do "anything in their favor, making temporary moves."
"Putin has violated every provision of international law, and he should be charged, held accountable, and imprisoned, possibly executed," the head of the military committee added.