Failure of the UN Security Council resolution of July 19 to great extent spurred the diplomatic and military activities. First Kofi Annan, UN Special Envoy for Syria, resigned, and then in violation of UN Charter the Syrian issue was transferred to the UN General Assembly, where a new resolution was adopted.
Formally Kofi Annan refused to continue his mission claiming lack of support from international community. How should one understand it? The majority of countries supported him without any conditions attached. It’s clear the resignation of Kofi Annan was a response to the veto of Russia and China.