Belarus has not expressed a desire to join NATO but has participated in the Individual Partnership Program since 1997, and Belarus provides refueling and airspace support for the ISAF mission in Afghanistan. Belarus first began to cooperate with NATO upon signing documents to participate in their Partnership for Peace Program in 1995. However, Belarus cannot join NATO because it is a member of the Collective Security Treaty Organisation. Tensions between NATO and Belarus peaked after the March 2006 presidential election in Belarus.