Its been 30 years since I was on a submarine, but like most guys I like to read about weapons development when articles are published. I hadn't heard about the sunburn anti-ship missile before. It sounds very similar to the US Harpoon missile, which skims the water to avoid radar. http://en.wikipedia.org/wiki/Harpoon_(missile)
During the 1982 Falklands/Malvinas War http://en.wikipedia.org/wiki/Malvinas_War, a British ship with modern NATO defenses was sunk by a similar Argentine Exocet missile purchased from France. http://en.wikipedia.org/wiki/Exocet
Another weapon of concern is the Russian-made Shkval torpedo ("Squall" [storm]). Oddly, it is an underwater rocket, rather than having a propellor. If a near-silent electric submarine can get close enough to an adversary, the speed of the underwater rocket makes evasive maneuvers and counter-measures less effective.
http://en.wikipedia.org/wiki/VA-111_Shkval
Nuclear weapons have been tested underwater, and if there is fear of an Iranian submarine on the prowl after a western ship is sunk (even if sunk by a mine), a small nuke "could" be used to clear mines and Iranian submarines in the narrow Straight of Hormuz. One example of a small tactical nuke is the Subroc, which is a missile that is launched from a torpedo tube. http://en.wikipedia.org/wiki/SUBROC
In an unusual move, the US has now deployed TWO aircraft carriers to the Straights...
http://rt.com/news/us-strait-hormuz-gulf-409/