Ever since the Harmel report, NATO has been committed to a broad approach to security, including arms control, disarmament and other co-operative security tools as necessary complement to military capabilities. The declaration on Alliance security adopted by the 2009 Strasbourg summit reflects this twofold approach by restating that deterrence, including through nuclear capabilities, will remain a core element of NATO strategy, while at the same time NATO will continue to play its part in reinforcing arms control and promoting nuclear and conventional disarmament and non-proliferation.