Obama wouldn't start a new conflict at this point and Trump has openly questioned the need for NATO. If Turkey wanted/needed support from NATO the US wouldn't c

Obama wouldn't start a new conflict at this point and Trump has openly questioned the need for NATO. If Turkey wanted/needed support from NATO the US wouldn't come, and it's unlikely that many other Allies would join them if the US did not (since that would risk pushing the US from belligerence to actual alignment with Russia, and the immediate end of NATO).