Syria’s air force carried out strikes against rebels at more than double its usual rate on Monday, according to a monitoring group, ramping up its offensive near the capital while Washington strikes Islamic State fighters far away.

The intensified air strikes by President Bashar al-Assad’s government will add to the fear among Assad’s opponents that he is taking advantage of the U.S. strikes to crush other foes, including the “moderate opposition” that Washington backs.

The United States says it does not want to help Assad’s government despite bombing Islamic State, the most powerful group fighting against Damascus in a three year civil war. Washington aims to help arm moderates to fight against both Assad and Islamic State. […]