The Soviet Union never threatened war or started a blockade in response to the deployment of Jupiter missiles in Turkey. Those missiles were a key cause of the Soviet decision to send nuclear weapons to Cuba, but the Turkish missiles were never directly at the center of a crisis.

Interestingly, it's not just the location that made the Jupiters provocative to Moscow. They were obsolescent missiles, practically test platforms, that required lengthy and very visible launch preparations. The Jupiters therefore had very little potential as a retaliatory weapon. They were only strategically useful in a first strike situation.

The Soviets were outraged and incredulous that such a provocative weapon was deployed so close to their borders. They saw Kennedy's core motivation - the political and strategic need to include Turkey in the US nuclear umbrella - but the Jupiters introduced a lot of doubt about Kennedy's intentions and the reliability of his public promises. They were also afraid the Jupiters introduced a "use em or lose em" argument for a US first strike in any crisis.

The Jupiters terribly damaged relations and trust between the two superpowers. Without their deployment, it's unthinkable that Khrushchev would have risked so much by deploying nukes in Cuba.