While Obama has resisted putting US troops into Syria, he sent 50 US special operations forces to Syria last year in what US officials described as a “counterterrorism” mission.

President Barack Obama will announce on Monday he plans to send as many as 250 additional US troops to Syria, a sharp increase in the American presence working with local Syrian forces fighting ISIS militants, US officials said.

The deployment, which will increase US forces in Syria to about 300, aims to accelerate recent gains against ISIS and appears to reflect growing confidence in the ability of US-backed forces inside Syria and Iraq to claw back territory from the hardline group.

Obama will explain his decision in a speech at 0925 GMT in Hanover, where he discussed the Syria crisis with German Chancellor Angela Merkel on Sunday. They will meet with other major European leaders after his remarks.

ISIS controls the cities of Mosul in Iraq and Raqqa in Syria and is proving a potent threat abroad, claiming credit for major attacks in Paris in November and Brussels in March.

While Obama has resisted putting US troops into Syria, where a five-year civil war has killed at least 250,000 people, he sent 50 US special operations forces to Syria last year in what US officials described as a “counterterrorism” mission rather than an effort to tip the scales in the war.

His decision to boost those numbers was first reported by the Wall Street Journal on Sunday and confirmed an April 1 Reuters report that the Obama administration was considering a significant increase in US forces.

“He (Obama) intends to put in more … forces to the tune of 250 in Syria,” one US official said on Sunday, adding he was unable to break down how many of those would be special operations forces and how many might be medical or intelligence support personnel.

“The president has authorized a series of steps to increase support for our partners in the region, including Iraqi security forces as well as local Syrian forces who are taking the fight to ISIL,” said a second Obama administration official.

Obama pledged to wind down wars in the Middle East when he was first elected in 2008. But in the latter part of his presidency, he has found it necessary to keep or add troops to help with conflicts in Iraq, Syria and Afghanistan.

The president is ending a six-day international trip that began in Riyadh, where he held talks with Gulf Arab monarchs concerned that Washington’s commitment to the Middle East had diminished.

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