Erdogan said that many Syrians had fled to Idlib from the neighbouring Aleppo province, which was rocked by heavy fighting a year ago, and Turkey was not going to let them down.
"Today a landmark operation is underway in Idlib, and it will continue", Erdogan said at the ruling Justice and Development Party's meeting in Turkey's western province of Afyonkarahisar.
TRT World's Sara Firth, who is in the southern Turkish province of Hatay on the Mediterranean coast, explains the latest efforts to build a safe zone in northern Syria.
Cavusoglu said Turkey has never sought confrontation with Germany, but only reacted to growing anti-Turkish and anti-Erdogan rhetoric in the country, which is home to 3 million Turkish immigrants. Turkish shelling hit near a camp for displaced civilians by the border, prompting some to flee the area, it said, and HTS fighters also shelled a Turkish position near the Bab al- Hawa border crossing.
On Saturday the alliance warned Ankara-backed rebels it described as "treacherous factions that stand by the side of the Russian occupier".
Meanwhile, the HTS said entering Idlib by the Turkish-backed rebels "will not be a picnic".
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HTS wants to continue fighting the government despite the establishment of "de-escalation zones".
Turkey has been one of the biggest supporters of rebels fighting Syrian President Bashar al-Assad during the six-and-a-half-year war, but its focus has moved from ousting him to securing its own border.
Most of Idlib is controlled by hard-line militants, including an Al-Qaeda linked group, now the most powerful faction in the province and formerly known as the Al-Nusra Front. However, both Iran and Russian Federation are chief supporters of Assad and have strengthened his control over Syria.
Sporadic clashes have been reported on Sunday between the Turkish forces and the Hay'at Tahrir al-Sham rebels on the Turkish-Syrian border, media reports said.
The military offensive is aimed at ending the jihadist control of the Idlib area.
"Since we do not allow any operations against our own country, we will also not allow any operations against the territorial integrity of our neighbors", he said.
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