if it's not fake news: nothing will happen. turkey shot down a russian plane when both nations had a serious dispute. nowadays they make billion dollar weapon deals. russia will not retaliate if it was a mistake
We did for the most part. the rest you should ask the people in the government.
the real question is not when we withdraw tho, its when(how) will we kick the syrians from turkey cuz there are as many syrians in turkey as they are in syria. so i guess the answer to your question is never.