About 500 demonstrators gathered in front of the Serbian Parliament in Belgrade, Saturday, to commemorate the 19th anniversary of NATO's intervention in Yugoslavia. Protesters waved flags and lit flares, while other held banners with messages against NATO written on them. The NATO bombing of Yugoslavia was a military operation against the Serbian people and the Federal Republic of Yugoslavia... Еще (Serbia and Montenegro) during the Kosovo War. It was the first time that the organisation used military force without the approval of the UN Security Council. The air strikes lasted from March 24 to June 10, 1999.