Turkish presidential spokesman Ibrahim Kalin says Ankara-Moscow joint effort follows Monday's agreement between the two countries to establish a dimilitarised buffer in Idlib, Syria's last opposition stronghold.
Tensions escalate as Washington slaps financial sanctions on a Chinese military unit for purchasing Russian Sukhoi Su-35 fighter jets and S-400 surface-to-air missiles.
The assault on Idlib has been prevented, for now. The only way to prevent a future offensive, though, will be to get the US, Turkey and NATO on a united track.
The US State Department said it is investigating whether the illnesses were acoustic attacks or a form of viral warfare.
The deal reached between Turkey and Russia this week on Syria's Idlib province has raised hopes of finding a diplomatic solution to the war in the country.
Northern Idlib province is the last major opposition and rebel stronghold in Syria. Diplomatic moves by Turkey and Russia have defused the threat of an imminent regime attack. Much must still be done to ensure the safety of civilians in the region.
As China and the US vye for political and economic influence in several regions, the rivalry will inevitably turn into a clash. Which country is best placed to come out on top?
The US president insists that Beijing is using tariffs to influence American voters into changing their position ahead of a crucial congressional elections in November.
Poland's President Andrzej Duda asks the US to station more troops in his country and wants to increase the volume of liquefied gas contracts with the US to cut its dependence on gas imports from Russia.
The Russian Defence Ministry says 15 service people died in the incident off the Syrian coast after Israeli fighters forced the warplane into the path of regime air defence systems.
Russia's Defence Minister Sergey Shoigu said the country will not carry out a military operation in Syria's Idlib. Meanwhile, Turkey's FM Mevlut Cavusoglu says there would be no change in status of Syria's Idlib after deal signed by Turkey, Russia.
US Ambassador Nikki Haley told a Security Council meeting that Russia "cheated" on UN sanctions on North Korea, while Russia's UN ambassador said the US was blocking steps to foster cooperation between North and South Korea.
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