The French anti-submarine frigate La Motte-Picquet has arrived in Cardiff Bay.
It joins a Latvian ship and the British HMS Duncan.
Ships from other NATO member states Lithuania, Norway & Netherlands are still to come.
Top policeman at Nato Summit says stun grenades were destroyed an hour before they were set to explode in path of world leaders.
'Meet the Forces' day was a crowd puller on Sunday as warships open up their decks in Cardiff Bay following Nato summit.
The day began with a spectacular fly-past over Cardiff and Newport by Nato aircraft.