WASHINGTON - President Barack Obama said he has been wrestling with the question whether a US military intervention in Syria's 22-month-old civil war would help resolve the bloody conflict or make things worse.In a pair of interviews, Obama responded to critics who say the United States has not been involved enough in Syria, where thousands of people have been killed and millions displaced according to UN officials. Transcripts of both interviews were released on Sunday.The United States has called on Syrian President Bashar Assad to step down, and has recognized an opposition coalition - but has stopped short of authorizing US arming of rebels to overthrow Assad."In a situation like Syria, I have to ask: can we make a difference in that situation?" Obama said in an interview with The New Republic published on the magazine's website.Obama said he has to weigh the benefit of a military intervention with the ability of the Pentagon to support troops still in Afghanistan, where the United States is withdrawing combat forces after a dozen years of war."Could it trigger even worse violence or the use of chemical weapons? What offers the best prospect of a stable post-Assad regime? "And how do I weigh tens of thousands who've been killed in Syria versus the tens of thousands who are currently being killed in the Congo?" he said.Obama's comments come as world leaders gathered in Davos, Switzerland, said they wished the United States were more engaged in geopolitical issues such as the conflicts in Syria and Mali, where France is attacking al Qaida-affiliated militants. Defense Secretary Leon Panetta said on Saturday that the United States will fly tankers to refuel French jet fighters, expanding US involvement, which had been limited to sharing intelligence and providing airlift support.In an interview with CBS television program "60 Minutes," Obama bristled when asked to respond to criticism that the United States has been reluctant to engage in foreign policy issues like the Syrian crisis.