"We are discussing this issue with Russian Federation and Iran", he told a news conference in Beirut.
This completes their takeover of the formerly opposition and rebel-held region just south of Idlib province for the first time since 2012, a war monitoring group and Syrian state TV said on Friday.
The region surrounding the city of Idlib is the last major rebel stronghold remaining in Syria from an uprising that began in 2011.
The Morek observation post, established under a deal with Moscow, is one of 12 the Turkish army set up along the front line between Syrian government forces on one side - and the jihadists and Ankara's rebel allies on the other side - a year ago.
Akar and Esper also agreed that military delegations from the two countries will meet in Ankara soon to discuss the next stages of the safe zone plan, it said.
The Kremlin said Putin and Erdogan agreed during the phone conversation to "activate mutual efforts" to ease the situation in Idlib Province where the surge of violence has forced tens of thousands of people to flee in recent days.
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But the jihadists failed to pull back from the zone as agreed and in April, government and Russian forces resumed intense bombardment of the region.
Turkish President Tayyip Erdogan told Russia's Vladimir Putin on Friday that Syrian army attacks in northwest Syria are causing a humanitarian crisis and threaten Turkey's national security, the Turkish presidency said.
"These attacks damage the efforts to regulate the Syrian conflict", the office said.
Since January, it has been ruled by the Hayat Tahrir al-Sham alliance, which is led by jihadists from Syria's former Al-Qaeda affiliate. Since late April, Syria and Russian Federation have escalated their bombardment of Idlib, with more than 500 civilians being killed in the hostilities, according to the UN. However, Ankara previous year struck a deal with Moscow to protect the Idlib province from a potential government offensive.
"Armed terrorist groups have lost the ability to stop our army's heroes" it said. The attacks killed several people, including staff members of partner organizations and civilians, according to the ministries' information.
He appealed for a political solution to the long-running Syria crisis that would put an end to more displacement and allow for the safe return of Syrian refugees.