In his comments to Anadolu today, Cavusoglu insisted that Turkey had been trying to enforce the cease-fire in Idlib so that civilians could continue to return, but "some terrorist groups have infiltrated the region".
Both the US and Turkish interventions in Syria, however, have been dwarfed by that of Assad supporters Russian Federation and Iran.
"We shared our concerns about the U.S. giving armed weapons' training to members" of the Syrian Kurdish Democratic Union Party's (PYD) militia with the USA charge d'affaires Philip Kosnett, Turkish foreign ministry sources said.
The de-escalation zones were set up last September in an effort to scale back the conflict. Turkish Foreign Minister Mevlüt Çavuşoğlu told journalists, "Russia and Iran must fulfill their obligations and stop the pro-Assad offensive in Idlib province".
On Tuesday, Turkey gathered Russian Federation and Iran's ambassadors to air its displeasure, saying the offensive must be called off immediately.
Earlier Russia's Ambassador to Ankara Alexei Yerkhov and Iranian Ambassador Mohammad Ebrahim Taherian Fard were summoned to the ministry for the same reason. Turkey also sees the YPG as an extension of the outlawed Kurdistan Workers Party (PKK), and believes it is waging an insurgency against the Turkish state. Erdoğan has threatened to expand the Turkish military operation in northern Syria ("Euphrates Shield") by taking over YPG-controlled Manbij and the Afrin enclave in Idlib province.
The escalation of the fighting between Syrian government troops openly aided and abetted by Russian Federation and Iran on one hand and opposition militias deployed in the Idlib province - the only major swath of territory still in the hands of the opposition - is sparking a Turkish outcry for fear that the onslaught on opposition risks destroying the very foundation of the "de- escalation zone" arrangement in the province.
The home-made drones reportedly had Global Positioning System homing devices and altitude-meters to guide them to the Russian bases.
Rebels launched a counter-attack on Thursday.
Meanwhile, Syrian government forces, backed by warplanes and attack helicopters, are closing in on the strategic Abu al-Duhur air base in the eastern Idlib countryside.