NATO member Turkey has long backed Syria's armed and political opposition to ousted leader Bashar al-Assad, who was toppled in late December.
"Everyone should take their hands off Syria and we, along with our Syrian siblings, will crush the heads of Islamic State, the YPG and other terrorist organizations in a short time."
In a speech in the Turkish parliament on Friday, Gulistan Kilic Kocyigit, co-chair of the DEM Party, condemned the killing of the journalists.
Ankara views the main Syrian Kurdish factions as an extension of the PKK.
Turkey’s influence grows in Syria post-Assad, raising questions about Erdogan’s next move toward Israel.
Syrian rebels take Hama, but Erdogan warns of challenges with terror-linked groups in their midst.
The US noted that President Bashar al-Assad's "regime" has been part of an ongoing refusal to "engage in a political process," which has "created the conditions now unfolding."
Renewed violence displaces Kurds as HTS and Turkey-backed militias advance.
Assad had recently said that he saw Russia’s growing role in the world has helpful to maintain a multi-polar world order.
The Syrian regime wants Ankara to return to the status quo of 2011, before the Syrian revolution and civil war.