UK Labour leader Sir Keir Starmer arrived in Llandudno from Estonia.
He used his speech to Welsh Labour conference on Saturday to praise the work of Nato troop, including the Royal Tank Regiment and Royal Welsh Battlegroup.
He said he "was able to thank them first-hand" for their work and added: "I was able to confirm to them, and to senior politicians in Estonia, Labour’s unshakeable commitment to Nato and I was able to reassure them in the face of Russian aggression in Ukraine we stand united in the United Kingdom."