The US feels India’s fears of terrorists using sea routes to sustain their campaign are well-grounded and has suggested that counter-measures like Container Security Initiative need to be ratified soon. “Such fears are realistic as terrorists are feeling hemmed in their present sanctuaries,” top US Admiral Timothy J Keating said here, adding, “possibilities of their using maritime domain are alive”. A joint strategy needs to be evolved to combat such tactics and “we are in dialogue with nations on this”, Keating, Commander of the key US Pacific Command, now on a visit here, said.