Guinea has participated in both diplomatic and military efforts to resolve conflicts in Liberia, Sierra Leone, and Guinea-Bissau, and contributed contingents of troops to peacekeeping operations in all three countries as part of ECOMOG, the Military Observer Group of ECOWAS. In the 1990s, Guinea hosted almost a million refugees fleeing the civil wars in Sierra Leone and Liberia. As of 2004, Guinea maintained a policy of unrestricted admission to refugees.