Implications of the US decision to arm Syrian rebels.

I think this is a mistake, and never mind the possible Russian response, because there is no reliable way to support the secular rebels and avoid helping the Saudi-supported jihadi fanatics.

It looks like this is developing into a war between Sunnis and Shi'ites, and it would be bad for the US to take a side in that war. Both sides produce theocracies (Saudi Arabia and Iran) that are among the most evil regimes on Earth.