How about "forced".

This is intimately connected to Turkey's role in bringing down the Saudis in the Kashoggi affair. Saudi Arabia is a prime Trump ally in Trump's war on Iran. Without them, we can't pressure the mullahs or keep oil prices low; not to mention all the business we do with the Kingdom that the Donald is so keen on. Erdogan's ultimate goal is to set himself up as a fascist dictator for life, and to become a Muslim leader in the middle east as well as a key player in the EU and Nato. Now he knows he won't get any pushback from the USA. Not that I blame him, Russia's on his doorstep and he knows he can't count on America for help.

Erdogan is blackmailing Trump, just like Putin is (but for different reasons). But its not "collusion". It's just shameful.