The supplier would be the EU, but it strictly controls the export of any drugs which could be used for capital punishment, torture or inhumantreatment.
No Turkish people defend any barbarous act against any nation, any time, so even it happened in those days, any inhumantreatment can't be admitted by any Turk.
Is the lesson of this episode that any ruthless group or government can demand a symbolic meeting with a senior American by seizing hostages or threatening inhumantreatment for prisoners in their hand?