It looks like one of their cruisers to me but thats as far as I can go with it.
Maybe Jeff Head knows.
looks like a massive secret radar system.
However, in this case, it would have plenty of Marines and helos and small craft though and more than capable, if necessary of putting a force on this hijacked vessel to recover it.
The real shark in the water that we have there will be the Arliegh Burke destroyers.