Within two months, the U.S. has captured Venezuela’s president and killed Iran’s supreme leader. Is Putin worried he could be next?

In the span of just two months, U.S. President Donald Trump has overseen the forcible removal of two sitting foreign leaders: Venezuelan President Nicolás Maduro and Iranian Supreme Leader Ali Khamenei. Both men were long-standing autocrats who cultivated anti-Western agendas and opposed U.S. influence abroad. Vladimir Putin has at times employed similar tactics, raising obvious questions for the Russian leader: Is he at risk of the same fate? And what the new war mean for a Kremlin that’s in...