Following President Barack Obama's Oval Office address Sunday night, award-winning foreign correspondent Rukmini Callimachi added her expertise to the conversation in a 19-tweet marathon that could easily comprise the syllabus of an ISIS 101 course. 

Callimachi, who covers al-Qaida and ISIS for the New York Times, shed light on the biggest problems not addressed in the president's four-pronged plan to combat the Islamic State.

But first, the reporter praised the president for "do[ing] his homework" in acknowledging that sending troops to Iraq and Syria would be playing into the hands of ISIS, who, she said, is desperate for the U.S. to bring the war to them.

"We should not be drawn once more into a long and costly ground war in Iraq or Syria," the president said in his address. "That's what groups like ISIL want. ... They also know that if we occupy foreign lands, they can maintain insurgencies for years, killing thousands of our troops, draining our resources and using our presence to draw new recruits."