A vote on a Security Council resolution demanding a 30-day humanitarian cease-fire is delayed over the timing of a halt to fighting.
The attack raises the specter of a full-scale offensive that could mean catastrophe for nearly 400,000 civilians trapped under siege.
As Syrian President Bashar Assad’s fight against Islamic State draws to a close, violence has exploded in other areas, threatening an even broader confrontation among regional and world powers.
The airman reportedly is slain on the ground in an exchange of gunfire with militants trying to capture him. A British-based group has confirmed his death.
The House speaker is leading a congressional group that will focus on stability in the Middle East, the campaign against Islamic State and "Iranian aggression."
The U.S. faces a more favorable foreign policy environment than it has in some years. Ironically, some of the more severe challenges emanate from President Trump.