If the plane was in Turkish aerospace (black box or military sat coordinates should help with that) or if the crew is dead, then it would be political suicide for the leading party in Turkey not to take any action... every one expects Turkey to act with NATO / west.. but Turkey might choose otherwise..
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Russian jet hit inside Syria after incursion into Turkey, U.S. official says (Reuters)
from the article: Turkey warns it would respond decisively to Syria downing its aircraft