About the improved Kilo class submarine "Rostov on Don", it actually did come from the Arctic, as it was a new sub and was being tested there. It also made a stop in Kronshtat for a minor refit/rearmament before proceding to it's launch area in Med.
About the logistics and the straits. What Turkey did do in the past is to try to unilaterally enforce the status of internal waters or even port waters ("port of Istambul") onto the straights. This means that under internal turkish regulations they could delay or stop traffic, including military traffic.
Because this status was declared unilaterally by Turkey, Russia can (and would) ignore it and act in accordance to the UN conventions and other international agreements applicable.
In the past turks did try to interfere with our passage (ie about 10 years ago they blocked the ship's path and ordered our Large Landing Ship to stop and prepare to be borded) but so far it blew into their face (the landing ship in question did not stop, went to battle stations, prepared armed security teams and trained it's arty on the turkish boat in question and prepared for ramming, the boat retreated.)
As such, should turks block the straights it would be de facto declaration of war against Russia with all the consequences. Logistics wise we could always supply stuff in Syria via Med, if the straights get closed and there is no all out war we have to take care of. Economy wise - a lot of our oil exports go through the straights (and exports in general), but as their closure would be de facto declaration of war that would be a secondary concern.
What turks could do is to make our life harder, with delays on passage. Those delays however can be objective in nature (ie large ammount of traffic going through).
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Grumpy as always.
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