Some countries are sceptical about full British involvement in the EU's defence investment fund - with senior officials saying it will undermine the bloc's supply chain

The two leaders are set to confirm details of a strengthened defense relationship at a summit Thursday. An agreement on tackling unauthorized migration may also be announced.

France and Britain on Thursday agreed to reinforce cooperation over their respective nuclear arsenals as the two European powerhouses seek to respond to growing threats to the continent and uncertainty over their U.