Islamic State of Iraq and Syria (ISIS) has vowed to defeat Russia in Syria after the former launched airstrikes against the militants last month.
According to News24, ISIS spokesman Abu Mohamed al-Adnani said in an audio recording that they would defeat Russia.
He called upon Muslims everywhere to launch "jihad" against Russians and Americans.
Adnani said the US was weak and unable to fight the jihadist group and was using Iran and Russia to strengthen its position in Syria.