WASHINGTON — The United States and its anti-Islamic State coalition allies said Thursday they’ve reached a key moment in their campaign to defeat the extremist group, despite several months of limited ground gains and major terrorist attacks.

After two days of talks in Washington, a joint statement cited steady progress by Iraqi forces and Syrian opposition militias as they edge closer to Mosul, the Islamic State’s headquarters in Iraq, and Raqqa, its Syrian base of operations.

But the 30 countries that sent top diplomats and defense officials also learned of only limited territorial advances.

“Our coalition and our partners on the ground have driven Daesh out of nearly half the territory it once occupied in Iraq and 20 percent in Syria,” Secretary of State John Kerry told participants, using an alternate acronym for the group. Those numbers are barely better than they were in January.

Kerry cited other markers of success, such as the recapture of Iraqi cities including Ramadi and Fallujah. Airstrikes have killed Islamic State leaders and disrupted the group’s military operations, he said. Security has tightened along the Syria-Turkey border. Coalition attacks have eliminated Islamic State oil facilities, tanker trucks and cash storage sites.