The Moscow terror attack shows the limits of the Russia-Iran partnership

A regional branch of the Islamic State has claimed responsibility for two recent terrorist attacks, each of which killed more than 100 people. Islamic State-Khorasan Province (ISIS-K) was behind both the attack at a Moscow-area concert hall on March 22 and the bombing of a memorial ceremony in southeastern Iran for Qassem Soleimani, commander of the elite Quds Force, in January. This mutual threat could have further bound together Russia and Iran, two nations which have been deepening their ties during the war in Ukraine. Instead, it seems more likely to become a point of friction. Although ISIS-K has claimed…