The Russian frigate "Admiral Gorshkov" conducted exercises in the Pacific Ocean to search for submarines, reports TASS with reference to the press service of the Northern Fleet.
"The exercises were held in the central part of the Pacific Ocean, south-east of the Hawaiian Islands," the press service said.
The search for the submarine "Admiral Gorshkov" was engaged with the help of onboard sonar weapons, the Ka-27 helicopter also took part in the exercises. During the flight, the helicopter used a descending hydroacoustic station.
Edit: I think the 'South East' is probably actually North West, Google translate seems to have problems with compass directions like that.
Edit2: though Yandex also says South East