They wanted a broken feeble Syrian state with no Capacity but with Assad in power(better the devil you know than not know)
Biden came to Turkey and said they did not want regime change.
www.middleeasteye.net
So when that Rebel offensive happened, they initially didn't know how to react, so they are winging it as they go along.
Thats why that Trump statement about "Turkey did an unfriendly action in Syria" came out.
They didn't view it positively internally, b/c of the unknown factor.
President-elect Donald Trump characterized the rebel ouster of Syrian strongman Bashar al-Assad as an "unfriendly takeover" by US ally Turkey as he addressed the conflict at a news conference on Monday.…
www.france24.com