Kara-Murza's sentence is the harshest prison term delivered yet to a government opponent since the Kremlin launched its war in Ukraine in February 2022.
The law could have big implications for the Kremlin's war plans in Ukraine, especially as it tries to recruit thousands more troops in anticipation of a Ukrainian counteroffensive.
Evan Gershkovich, a U.S. citizen, was on a reporting assignment in the Ural mountain city of Yekaterinburg when he was detained by agents from Russia's Federal Security Service.
Built largely with Western donations, the spa-like retreat provides soldiers with counseling, aromatherapy and more. But most soldiers are there for no more than a week.
Former service members and combat medics from other countries are in Ukraine to train civilians. They typically have just days with new conscripts before they are sent to the front.
Moscow said the long-anticipated visit is coming at the invitation of President Vladimir Putin. The talks are expected to focus on the war in Ukraine, though it wasn't mentioned explicitly.
The United States accused Russia of an "unsafe" and "unprofessional" intercept of its MQ-9 Reaper surveillance drone that forced it to be brought down over the Black Sea this week
The Russians claim the U.S. drone crashed on its own. Either way, it appears to be the most serious incident involving the U.S. and Russian militaries in the volatile region in and around Ukraine.
Ukrainian officials say at least six people were killed in Lviv and other cities in a Russian bombardment that included advanced Kinzhal missiles, which air defenses can't shoot down.
Prime Minister Kaja Kallas has led the former Soviet republic since 2021. She's an outspoken critic of Russian President Vladimir Putin, and a vocal supporter of Ukraine.
Relations between the two countrieshave collapsed over the Ukraine war, with the U.S. slapping thousands of sanctions on Russia, and militarily, economically and diplomatically supporting Ukraine.