Short answers, pulled from the story.
The Turkish Straits crisis was a Cold War territorial conflict between Turkey and the Soviet Union over control of the Dardanelles and Bosporus waterways. This dispute involved Soviet demands to renegotiate strait regulations and claim territory along the Turkish-Armenian-Georgian border during 1945 and 1946.
Soviet pressure on Turkey began in 1945 when they declined to extend the 1925 non-aggression treaty and resumed straits discussions in 1946. The crisis concluded by the 26th of October 1946 when the Soviet Union withdrew its request for a new summit, with formal claims ending on the 30th of May 1953.
The primary participants included the Soviet Union under Joseph Stalin and Turkey led by President İnönü and Ambassador Faik Akdur. Other nations such as the United States, United Kingdom, Germany, Italy, Greece, Romania, Bulgaria, France, Japan, Australia, and Yugoslavia influenced the geopolitical context through treaties like Montreux and NATO membership.
Control over the Dardanelles and Bosporus determined which powers could move naval forces into or out of the Black Sea while blocking rival fleets from entering. Russia sought ice-free ports requiring access through these channels to reach global oceans, making the straits a vital trade route for Turkey, the USSR, Romania, and Bulgaria.
President Harry S. Truman sent a naval task force to Turkey in response to Soviet intimidation and reaffirmed support for Turkey alongside the United Kingdom on the 9th of October 1946. The US provided one hundred million dollars in economic and defense aid to Turkey in 1947 under the Truman Doctrine plan to cease the spread of Soviet influence.