Washington: President Barack Obama said on Monday the planned deployment of dozens of US special forces to Syria to advise opposition forces fighting Islamic State did not break his promise not to put "boots on the ground" in the Syrian conflict.

"Keep in mind that we have run special ops already and really this is just an extension of what we are continuing to do," Obama said in an interview on "NBC Nightly News" in his first public comments on the deployment since it was announced on Friday.

"We are not putting US troops on the front lines fighting firefights with ISIL," Obama said, using another acronym for the Islamic State militant group. "I have been consistent throughout that we are not going to be fighting like we did in Iraq with battalions and occupations. That doesn't solve the problem."

In announcing the measure, the White House said the troops would be on a mission to "train, advise and assist" and would number fewer than 50.

The introduction of US forces on the ground marks a shift after more than a year of limiting the Syria mission to air strikes against Islamic State. Before last year, Obama, who has been averse to committing troops to Middle East wars, had ruled out an American presence on the ground in Syria.