Under the bizarre name “Olive Branch,” Turkey has launched an offensive against the Kurdish enclave of Afrin in northwestern Syria. This operation had been expected for the past week and only needed Moscow’s blessing to begin.US support for the struggle by Kurdish forces to drive Islamic State (ISIS) from northern Syria has long been a thorn in Turkey’s side, as has the establishment of an autonomous Kurdish region (Rojava). The backbone of the multi-ethnic Syrian Democratic Forces (SDF) is the Kurdish People’s Protection Units (YPG), which is considered by Turkey to be part and parcel of Turkey’s separatist Kurdistan Workers’ Party (PKK).Matters came to a head on January 13, when the US-led Combined Joint Task Force (CJTF) announced the formation of a 30,000-strong “Border Security Force,” half of which would consist of SDF veterans.The force would be deployed along the border with Turkey, the Iraqi border and along the Euphrates River Valley, an area which contains two of Rojava’s three regions.This was a red flag to Turkey’s already belligerent President Recep Tayyip Erdogan, who threatened to “strangle” this force “before it’s even born.”The US immediately backtracked.The Pentagon said this was “a mischaracterization of the training that we are providing to local security forces in Syria” and instead it was a “kind of security or stabilization force” or “some sort of hold force.” According to US Secretary of State Rex Tillerson: “Some people misspoke. We are not creating a border security force at all.”Erdogan warned that Turkey would destroy all terrorist nests in Syria, starting from the Afrin and Manbij regions, and that it would do so in about a week.In August 2016, a month after the attempted coup in Turkey, the Turkish army crossed the Syrian border and in Operation Euphrates Shield occupied most of the area west of the Euphrates and east of the third Kurdish region, Afrin, effectively blocking any attempt to create a Kurdish corridor south of the Turkish border.But Manbij, which lies west of the Euphrates, was captured by the SDF from ISIS in 2016 and is a thorn in Turkey’s eye.The Pentagon immediately distanced itself from Afrin and stated it did not support YPG elements in Afrin and did not consider them part of their fight against ISIS. “We are not involved with them at all,” the Pentagon’s spokesman added.The Syrian government has warned Turkey that combat operations in the Afrin area would be considered an act of aggression which would be met by Syrian air defenses.However, as Syrian airspace is controlled by Russia, on Thursday Turkey’s Chief of General Staff Hulusi Akar and head of the National Intelligence Agency (MIT) Hakan Fidan were sent to Moscow to meet with Russian Defense Minister Sergey Shoigu and Chief of General Staff Valery Gerasimov to pave the way for the operation.In August a Russian Center for Reconciliation was set up near the city of Afrin, but the personnel have now been withdrawn “to prevent potential provocation and exclude the threat to the life and well-being of Russian military [personnel].” On Saturday the Turkish General Staff announced that it had launched “Operation Olive Branch” to establish security and stability on Turkey’s borders, to eliminate terrorists and to save “our friends and brothers” (a reference to opposition forces backed by Turkey) from oppression and cruelty. It also claimed the right to self-defense while being respectful of Syria’s territorial integrity. In turn, the Russian Foreign Ministry expressed concern and called on the sides to exercise constraint.However, the Russian Defense Ministry put the blame for Turkey’s “extremely negative reaction” fair and square on “the provocative US steps aimed at the separation of regions with a predominantly Kurdish population” and “the Pentagon’s uncontrolled deliveries of modern weapons to the pro-US forces in northern Syria.”Nevertheless, Russia’s attempts to include Syria’s Kurdish minority in an overall settlement for Syria have suffered a major setback. A draft constitution for Syria put forward by Russia in Astana a year ago safeguarded the status of what it termed “Kurdish cultural autonomy.” With regard to the National Dialogue Congress which will take place in Sochi next week Russian Foreign Minister Sergey Lavrov has stated, “The Kurds are definitely part of the Syrian nation and we need to take their interests into consideration.”Furthermore, the opportunity for what Lavrov has called “a constructive dialogue” with the US has also been sacrificed on the altar of President Erdogan’s ambition. Former Turkish foreign minister Yasar Yakis believes an accommodation over the Kurdish question in Syria is a possible area of convergence between the US and Russia – if political and military developments do not get out of control. Which is what they at present show every sign of doing.The author is a commentator on Turkish affairs in the Danish and international press.