On 16 December 2011, Brigadier General Mustafa al-Sheikh, along with his brother, secretary of the Arab Socialist Ba'ath Party – Syria Region in the Idlib Governorate, and his son, a lieutenant in the army, defected from the Syrian government. On 6 January 2012, Sheikh announced his defection in a televised statement on Al Jazeera. In an interview in February 2012, Mustafa al-Sheikh said he battled with his conscience before defecting, mindful of his 37 years of service in the Syrian Army and of possible retribution against his extended family. He said the final straw had been a sexual assault by soldiers who took turns raping a young bride in a village near Hama. On 5 February 2012, Mustafa al-Sheikh announced the formation of the Supreme Revolutionary Military Council for the Liberation of Syria. This move was condemned by the Free Syrian Army. ColonelRiad al-Asaad, commander of the FSA, rejected Sheikh's formation and stated that Sheikh "represents himself. He has nothing to do with the Free Syrian Army." Malik al-Kurdi, a deputy commander in the FSA, called Sheikh's announcement "a knife in the back of the revolution". Bassma Kodmani, spokeswomen of the Syrian National Council, stated that the SNC was "wary" of Sheikh's announcement, and acknowledged tensions between Sheikh and the FSA. Lama al-Atassi, a Syrian opposition figure affiliated with the FSA, also condemned Sheikh's announcement. Despite his previous disputes with the FSA and Col. Riad al-Asaad, Sheikh and Asaad jointly announced the formation of the Higher Military Council, under the leadership of the Free Syrian Army, on 24 March 2012. Previously based in Turkey, Asaad and Sheikh moved the FSA's headquarters to rebel-held areas in northwestern Syria in late September 2012. Al-Sheikh stated that "We want very urgent intervention, outside of the security council due to the Russian veto. We want a coalition similar to what happened in Kosovo and the Ivory Coast." On 26 May 2012, al-Sheikh said government opponents had lost all faith in the United Nations Security Council, on which Damascus has Russia as a powerful backer. In another interview in November 2012, Sheikh warned "If there’s no quick decision to support us, we will all turn into terrorists." Sheikh opposes the Muslim Brotherhood of Syria. He was not present during a meeting of rebel leaders, most of them Sunni Islamists, in December 2012 in Antalya. The meeting established the Supreme Military Council, and Brig. Gen. Salim Idris was appointed as its chief of staff.
Post-military activities
In November 2013, it was reported that al-Sheikh and his son had applied for political asylum in Sweden. In January 2017, Mustafa al-Sheikh visited Moscow and met Mihhail Bogdanov, the deputy foreign minister of Russia. Sheikh praised the Russian military intervention in Syria, saying that "The intervention of Russia is different from the intervention of the rest of parties involved have other agendas. Russia is a great nation and doesn't need to occupy Syria", and "Aleppo became safe haven. I personally hope that enters, in the same way it did Aleppo, all other regions ." His visit and statements in Russia were condemned by other former FSA commanders, including Col. Hassan Hamada. Riad al-Asaad once again denounced Sheikh and claimed that they were enemies from the start, accusing Sheikh of being an agent for the Syrian government.
