Arrest the crews and hand them over to the Somali Courts for trial and sentencing
You gotta be kidding us, right?? WHAT Somali courts?? They don't even have a workable Govt, the place is just borderline anarchy. The country is just permanently racked with civil war, split into 3 warring quasi-independent states, and any courts that might still be working, are administering Sharia Law. If a Sharia Law court views piracy as an Islamic-inspired act against infidels, do you really imagine there will be any punishment handed out???
The Somali pirates families had better get down on their knees and pray to their God that the Russians were very reserved in their treatment of the last bunch of pirates, because the world was watching.
If the Russians really had their way... they would not only blast every single pirate boat out of the water... they would set to, and plaster most of Somalia with a naval barrage, that wouldn't leave a single thing standing.