The heads of state of Turkey, Russia, Serbia and Bulgaria formally inaugurate the TurkStream gas pipelines.
Turkey threatens to "strangle" the United States-backed Syrian Border Security Force "before it's even born", while Syria vows to crush it and expel American military personnel from the country. Russia called the plans "a plot to dismember Syria".
Turkish Foreign Minister Mevlüt Çavuşoğlu says Turkey's cooperation with Russia in combating the Islamic State in Syria does not include Russia's use of its Incirlik Air Base, which some have interpreted from his comments yesterday.
Russia's Foreign Ministry warns of "retaliatory measures" over the entry of the United States Navy destroyer, USS "Porter". The USS "Porter" arrived in the Black Sea port of Varna, Bulgaria, earlier this week for what the U.S. Navy called a routine deployment.
Russia's Ministry of Defence accuses Turkey of preparing a military incursion into northern Syria, saying it had registered "a growing number of signs of hidden preparation of the Turkish Armed Forces for active actions on the territory of Syria". Tens of thousands of Turkish troops are active on the border of Syria involved in fighting the Kurdistan Workers' Party (PKK).
Turkey’s Foreign Minister Mevlüt Çavuşoğlu accuses Russia of provoking military gestures as a sailor aboard a Russian naval vessel wielded a rocket launcher as the ship passed through the Bosphorous Strait in the wake of Russia’s imposing sanctions on Turkey for that country’s downing of a Russian aircraft
Russian President Vladimir Putin signs a decree imposing economic sanctions on Turkey. The sanctions include a ban on charter flights from Russia to Turkey, that Russian tour operators should stop selling trips to Turkey, and that imports of some Turkish products are to be halted. All work visas for Turkish citizens are cancelled.
At least one person is reportedly killed after Bulgarian border guards open fire on a group of illegal migrants after they attempted to cross the border from Turkey. The incident happened near the southeastern town of Sredets.
NATO Secretary-General Jens Stoltenberg says Russia's pair of violations of Turkish airspace over the weekend do not look like accidents. Russia, which said it's looking into claims of a second violation, reported the first violation lasted a few seconds and was due to poor weather.