The heads of state of Turkey, Russia, Serbia and Bulgaria formally inaugurate the TurkStream gas pipelines.
Hungary and Russia sign a natural gas supply deal which will see Gazprom supply Hungary with 4.5 billion cubic metres of gas annually via Serbia and Austria for the next 15 years. Ukraine criticizes the gas pact, saying that it is a "purely political, economically unreasonable decision". In response, Hungarian Foreign Minister Péter Szijjártó accuses Ukraine of "meddling" in its internal affairs.
Secretary of State Mike Pompeo announces that the United States has imposed sanctions on Turkey over its acquisition of the S-400 missile defense system from Russia. This move is the first time that the CAATSA has been used to penalize a U.S. ally.
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).
Turkish F-16 fighter jets shoot down a Russian Sukhoi Su-24 aircraft that had allegedly infringed its airspace near the Syrian border. Russia's Ministry of Defence denies the Su-24 entered Turkish airspace and initially said it was shot down by ground fire over Syria's Latakia Governorate. A video emerged of one pilot killed as local rebel Turkmen fighters shot at him while he was parachuting and a video of his body, while the fate of the other pilot is unknown but is presumed dead. A combat search and rescue mission by Russian forces failed to reach them. It is the first time a NATO member has shot down a Russian plane since the 1950s.
Turkey says investigators found Russian-made ammunition and military communications equipment in a Syrian passenger plane heading to Damascus from Moscow. Syria accuses Turkey of aircraft piracy, says the plane did not carry the alleged equipment and challenges Turkey to show evidence. [https:--www.reuters.com-article-2012-10-11-us-syria-crisis-idUSBRE88J0X720121011 (Reuters)] [http:--www.aljazeera.com-news-europe-2012-10-20121011182317469327.html (Al Jazeera)] [http:--www.thehindu.com-news-international-turkey-accused-of-air-piracy-article3987113.ece ("The Hindu")] [http:--sana.sy-eng-21-2012-10-12-446649.htm (SANA)]date=August 2019