By IVAN NECHEPURENKO A Moscow court Thursday handed down life sentences to 15 men in connection with a 2024 massacre that killed at least 149 people at a concert hall, the deadliest terror attack in Russia in two decades. The attack on the Crocus City Hall building, a popular entertainment venue outside Moscow, took place just before a rock concert was scheduled to start. It began as a shooting spree and ended with the four gunmen setting fire to the building with incendiary devices. The…