Here is a brief description of Spy Ship USNS Impeccable that is harassed by Chinese Ships as report has said. This info is from wikipedia.

"USNS Impeccable (T-AGOS-23) is an Impeccable-class ocean surveillance ship acquired by the U.S. Navy in 2001 and assigned to the Navy’s Special Missions Program. The mission of Impeccable is to directly support the Navy by using SURTASS passive and active low frequency sonar arrays to detect and track undersea threats."

Owner: Military Sealift Command
Builder: American Shipbuilding, Tampa, Florida
Laid down: 15 March 1992
Launched: 28 August 1998
Completed: at Halter Marine Inc., Gulfport, Mississippi, in 1995
Acquired: by the U.S. Navy, 22 March 2001
In service: 22 March 2001
Honors and awards: National Defense Service Medal
Status: Currently in service