Afghanistan, Dec. 22 -- Containing ISIS in Syria remains a significant challenge, as U.S. and allied forces continue airstrikes and counterterrorism operations, yet the group persists, the Wall Street Journal reports.

The United States conducted heavy airstrikes on more than 70 ISIS targets in Syria on Friday, December 20, following an ambush last week that killed three American citizens, the Wall Street Journal reported. Jordanian forces collaborated with U.S. troops, targeting ISIS infrastructure, weapons caches, and operational hubs.

The operation is part of a broader campaign, with over 80 joint missions in the past six months by U.S. forces and Kurdish militias. These included airstrikes and commando raids that eliminated several ISI...