HALIFAX -- Canada is sending another one of its frigates to help a NATO maritime force aiming to provide reassurance to eastern European allies that are jittery over the crisis in Ukraine.

The Defence Department says HMCS Fredericton will deploy in the coming weeks to replace HMCS Toronto in the Mediterranean Sea.

HMCS Toronto has been in the area since August.

The Defence Department says HMCS Fredericton will provide surveillance and monitoring.

It has a crew of 250 personnel of all ranks and carries a CH-124 Sea King helicopter and air detachment.