On February 2, 2014, al-Qaeda distanced itself from ISIS and its actions in Syria; however, during 2014-15, ISIS and the al-Qaeda-linked al-Nusra Front were still able to occasionally cooperate in their fight against the Syrian government. Al-Nusra (backed by Saudi Arabia and Turkey as part of the Army of Conquest during 2015-2017) launched many attacks and bombings, mostly against targets affiliated with or supportive of the Syrian government. From October 2015, Russian air strikes targeted positions held by al-Nusra Front, as well as other Islamist and non-Islamist rebels, while the US also targeted al-Nusra with airstrikes. In early 2016, a leading ISIL ideologue described al-Qaeda as the Jews of jihad.