"Wicked problems rarely have a right answer; in fact, part of what makes them wicked is that every option appears worse than the next. Increasingly that`s how Syria appeared," she wrote.
Clinton said that she returned to Washington from an overseas trip convinced that arming and training moderate Syrian rebels was the best move to turn the tide against strongman Bashar al-Assad.
"The risks of both action and inaction were high, [but] the president`s inclination was to stay the present course and not take the significant further step of arming rebels," she added.
"No one likes to lose a debate, including me. But this was the president`s call and I respected his deliberations and decision," she wrote, according to CBS News.
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