We do not know what other ships are under the command ships order of sail, but the intimation is that there may be a nuclear sub or two in the mix. If so, then the Russians need to be very, very careful as to what they actually do. They can posture and harp all the wish, but they surely do not want to send any Russian war ships inside of a 100 mile envelope of the Whitney.
A sub can take out every ship the Russians have and leave no trace of its existance, using cruise missiles or torpedoes, both GPS guided.
It's a violation of the Montreu(sic) Convention for submarines of non Black Sea powers to transit the Turkish straits, and the Turks are pretty anal about that these days. Besides, the straits are narrow, not deep, heavily traveled, and with tricky currents. The Bosporus bisects the city of Istanbul, formerly Constantinople. Hard to sneak much of anything through there. A sub might make it through at night and at periscope depth without being seen, if the Turks looked the other way that is.
Two problems. GPS is not real useful (except for "mid course guidance perhaps), when the targets can move. GPS doesn't always work well inside a building, let alone under salt water. Those missiles and torpedoes need some kind of active or passive seeker head, which they of course have.