The operation has been highly expected in the province, where al-Qaida-linked fighters enjoy wide influence, after last month's talks in the Kazakh capital of Astana during which Turkey, Iran and Russia agreed on setting up "a de- escalation zone" in the province.
The operation is aimed at eventually crushing al-Qaida in what may turn into a long and costly war. The extremist group has thousands of battle-hardened fighters and enjoys some popular support in the province, unlike the Islamic State group.
In late September, Russian President Vladimir Putin visited Turkey where he discussed the situation in Syria with Turkish President Recep Tayyip Erdogan and earlier this week the Turkish leader went to Tehran.
Erdogan said yesterday the operation was a "new step" to establish security in Idlib, promising Turkey would not desert civilians there.
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"Today, there is a serious operation in Idlib and it will continue," he said at his political party's conference in Afyonkarahisar province in western Turkey.
The Britain-based Syrian Observatory for Human Rights, which has activists throughout Syria, said Turkish troops removed some walls in some areas along the border in order to allow vehicles to pass. It said Idlib is tense amid fear of clashes between al-Qaida fighters and those of other militant groups.
The Observatory added that the expected Turkish operation in Idlib will be conducted under the cover of Russian airstrikes.
Turkish Chief of Staff Gen. Hulusi Akar and Ground Forces Commander General Yasar Guler and Air Force Commander Gen. Hasan Kucukakyuz arrived in the southern province of Hatay bordering Idlib yesterday to inspect preparations, according to a military statement.
A Syrian rebel commander speaking from Turkey said no military operations are ongoing at the moment but said preparations were underway for Turkish troops and FSA fighters to enter Idlib.
Erdogan told journalists that Turkey would provide security inside Idlib, with Russia on the periphery. Iran, Turkey and Russia reached the deal for four de-escalation zones earlier this year as part of their efforts to negotiate an end to the Syrian civil war.
Turkey's official Anadolu news agency reported that the Turkish "deployment" would be to reach de-escalation goals rather than engage in clashes with local militia or the Syrian army.
"The Idlib operation will allow us new initiatives on this issue," Erdogan said, referring to Turkey's aversion to Syrian Kurdish People's Protection Units or YPG efforts to link up their semi-autonomous territories in northern Syria.