In the 1990s, the organization extended its activities into political and humanitarian situations that had not formerly been NATO concerns. During the break-up of Yugoslavia, the organization conducted its first military interventions in Bosnia from 1992 to 1995 and later Yugoslavia in 1999. These conflicts motivated a major post-Cold War military restructuring. NATO's military structure was cut back and reorganized, with new forces such as the Headquarters Allied Command Europe Rapid Reaction Corps established. The changes brought about by the collapse of the Soviet Union on the military balance in Europe since the CFE treaty were recognized in the Adapted Conventional Armed Forces in Europe Treaty, which was signed at the 1999 Istanbul summit.