In a rare address to the nation from his Oval Office of the White House, Obama said his strategy to destroy ISIS is designed and supported by US military commanders and counter-terrorism experts, together with 65 countries that have joined an American-led coalition.

Obama said the threat from terrorism is real, but US will overcome it. "We will destroy ISIL (another name for ISIS) and any other organisation that tries to harm us," he said.

In his speech, Obama ruled out sending large scale troops on the ground. "We should not be drawn once more into a long and costly ground war in Iraq or Syria. That's what groups like ISIL want. They know they can't defeat us on the battlefield. ISIL fighters were part of the insurgency that we faced in Iraq," he said.

"The strategy that we are using now -- air strikes, special forces, and working with local forces who are fighting to regain control of their own country, that is how we'll achieve a more sustainable victory, and it won't require us sending a new generation of Americans overseas to fight and die for another decade on foreign soil," Obama said.

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