Islamic State faces major assaults on two fronts in Iraq, Syria

In Syria, U.S.-backed militia with thousands of Arab and Kurdish fighters were reported to have captured villages near the strategically-important Turkish border after launching a major operation to cut off Islamic State's last access route to the outside world.

In Iraq, Prime Minister Haider Abadi ordered his troops to slow an advance at the gates of Falluja, Islamic State's closest redoubt to the capital Baghdad, to limit harm to civilians, two days after the army poured into rural areas on the city's outskirts.

Both operations are unfolding with the support of a US-led coalition that has been targeting the ultra-hardline Sunni Muslim militants, who proclaimed a caliphate to rule over all Muslims from territory in the two neighboring countries.

The Syrian operation includes American special forces operating in advisory roles on the ground. In Iraq, the U.S.-led coalition has provided air support to government forces who are also assisted by Iranian-backed Shi'ite militia.

While there is no indication that the two advances were deliberately timed to coincide, they show how a variety of enemies of Islamic State have been mobilizing in recent months in what Washington and other world powers hope will be a decisive year of battle to destroy the group's pseudo-state.