Sen. John McCain implied Friday that Russian President Vladimir Putin will one day have to run away from Moscow.

“The United States must look beyond Mr. Putin. His regime may appear imposing, but it is rotting inside. His Russia is not a great power on par with America. It is a gas station run by a corrupt, autocratic regime,” McCain wrote in an opinion piece for The New York Times. “And eventually, Russians will come for Mr. Putin in the same way and for the same reasons that Ukrainians came for Viktor F. Yanukovych.”

Yanukovych left the Ukrainian capital of Kiev in February, which set off a flurry of events that have led to the current tension, with a widely-dismissed vote scheduled for Sunday on the future political status of the region of Crimea.

“What is most troubling about Mr. Putin’s aggression in Crimea is that it reflects a growing disregard for America’s credibility in the world. That has emboldened other aggressive actors — from Chinese nationalists to Al Qaeda terrorists and Iranian theocrats,” McCain wrote. “Crimea must be the place where President Obama recognizes this reality and begins to restore the credibility of the United States as a world leader.”