 Complete the following phrase:  In August 1999, Russia launched the Second Chechen War in response to the Invasion of Dagestan by the Islamic International Brigade. Dagestan borders Chechnya to the east, and as part of the operation Russian troops entered Chechnya on 1 October to restore federal control over the country, effectively ending its de facto independence. In March 2000, during the early phase of the war, Barayev reportedly betrayed the Chechen field commander Ruslan Gelayev to the Russian military forces, resulting in the massacre of Gelayevs forces in the 