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.
'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.
Members of the public will be allowed to tour the ship on Sunday.