and the pkk has been waging a terrorist war against the turkish state since the mid-1980s. so, here we have this extraordinarily complicated, and rather awkward situation, in which the united states, is working with, the sworn enemy of one of it's most important allies. - the united states introduced striker armored personnel carrier vehicles, to northern syria, and the stated official reason for that was to deter, using the word deter, attacks by turkey, on u.s. ally's kurdish militia forces. so, we're functionally now, putting assets in place, to prevent a u.s. ally, from striking another u.s. ally. that's a complicated relationship. (dramatic music) - [narrator] in 2016, turkish forces, loyal to erdogan, put down an attempted coup d'etat, which erdogan blamed on exiled cleric gulen. - [translator] i have never supported a coup, or an ouster. i think any change should happen as a result of an election, if that is required. it is important the democracy is not harmed. - erdogan has been reshuffling the senior military staff. he has been removing secular generals. if you kn