"We have both a moral obligation and a national security interest in, A, ending the slaughter in Syria, but, B, also ensuring that we've got a stable Syria that is representative of all the Syrian people, and is not creating chaos for its neighbors," Obama told reporters in a joint news conference with his visiting South Korean counterpart Park Geun-Hye yesterday.
"My job is to constantly measure our very real and legitimate humanitarian and national security interests in Syria, but measuring those against my bottom line, which is what's in the best interest of America's security and making sure that I'm making decisions not based on a hope and a prayer, but on hard-headed analysis in terms of what will actually make us safer and stabilise the region," Obama said.
"But don't make decisions based on 'perceived'. I can't organise international coalitions around 'perceived'. We've tried that in the past, by the way, and it didn't work out well," he said.
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"So we want to make sure that we have the best analysis possible. We want to make sure that we are acting deliberately," the US President said.
Obama pointed out that there have been several instances during the course of his presidency where he said he was going to do something and it ended up getting done.