France, Nov. 26 -- The summit brought together 80 delegations for negotiations on trade, minerals, migration and security. The final communique listed commitments to strengthen commercial ties, expand cooperation on strategic minerals and curb irregular migration while improving legal mobility.

It also set out a pledge to support a rules-based international order.

European Council President Antonio Costa warned that letting states undermine recognised borders risked wider instability.

"When we allow a state, whichever it may be, to flout the serenity and internationally recognised borders of another country, we authorise all of them to do the same," Costa said.

"That is why there is no alternative to the multilateral and international...