At least seven people are killed and eight are injured after a helicopter carrying Turkish Armed Forces personnel crashes in Turkey's northern Giresun Province, on the Black Sea coast.
Turkish President Recep Tayyip Erdoğan announced that the drilling ship "Fatih" has found 320 billion cubic meters of natural gas reserves in the Black Sea, Turkey's biggest natural gas find to date. If Turkey can extract the gas commercially, it will be able to reduce its reliance on imported energy.
Syrian Army shelling kills Turkish military personnel in Idlib Governorate, prompting retaliation by Turkish forces. A pro-opposition war monitor says the Turkish retaliation killed 13 Syrian soldiers, which Syria denies. The Russian Ministry of Defence says Turkey moved troops "inside the de-escalation zone [...] without notifying the Russian side". Turkish President Erdoğan says the Syrian shelling killed five Turkish soldiers and three civilian personnel, with nine others injured, and that the Russians "need to stand aside".
Turkish President Recep Tayyip Erdoğan says military operations will continue in southeast Turkey and vowed that Kurdish rebels (PKK) along with their supporters, “will be buried in the trenches they have dug”. The state-run Anadolu Agency reports at least 115 PKK militants have been killed since December 15.
Turkey refuses to withdraw its forces from northern Iraq despite being given a 48 hour ultimatum by Iraq to leave the country. Turkey says the troops are there as part of an international mission to train and equip Iraqi forces to fight against the Islamic State. The Iraqi government says it never invited such a force, and will take its case to the United Nations if they are not pulled out.
Fighting in the south-eastern Şırnak Province kills thirty-four PKK militants, four civilians, and two Turkish soldiers. Also, the Turkish military conducts airstrikes on PKK camps in Iraq's northern Dohuk Governorate.