Turkey had dual-key nuclear-tipped intermediate-range American "Thor" missiles in the early 60s; these were a factor in precipitating the 1962 Cuban missile crisis and as part of its resolution they were removed. What would the Russians, ever-sensitive to the possibility of being denied passage of the Bosporus, do at the prospect of Turkey acquiring The Bomb outside the NATO command structure?
the moving through bosphorus is within a treaty of montreux regulations.
Montreux Convention Regarding the Regime of the Turkish Straits - Wikipedia, the free encyclopedia
The Convention consists of 29 Articles, four annexes and one protocol. Articles 2-7 consider the passage of merchant ships. Articles 8-22 consider the passage of war vessels. The key principle of freedom of passage and navigation is stated in articles 1 and 2. Article 1 provides that "The High Contracting Parties recognise and affirm the principle of freedom of passage and navigation by sea in the Straits". Article 2 states that "In time of peace, merchant vessels shall enjoy complete freedom of passage and navigation in the Straits, by day and by night, under any flag with any kind of cargo."
The International Straits Commission was abolished, authorising the full resumption of Turkish military control over the Straits and the refortification of the Dardanelles. Turkey was authorised to close the Straits to all foreign warships in wartime or when it was threatened by aggression; additionally, it was authorised to refuse transit from merchant ships belonging to countries at war with Turkey. A number of highly specific restrictions were imposed on what type of warships are allowed passage. Non-Black Sea state warships in the Straits must be under 15,000 tons. No more than nine non-Black Sea state warships, with a total aggregate tonnage of no more than 30,000 tons, may pass at any one time, and they are permitted to stay in the Black Sea for no longer than twenty-one days.
Although the treaty is often cited as prohibiting aircraft carriers in the straits[9], there is no explicit prohibition on aircraft carriers in the treaty. However, the tonnage limits in Article 14, which apply to all non-Black Sea powers, would preclude the transit of modern aircraft carrying ships. In the case of non-Black Sea powers, these terms make it impossible for transit any modern ships carrying aircraft through the straits without violating the terms of the convention.