David Cameron has blocked plans for European Union owned military forces and told a summit of Europe's leaders that Nato is the "bedrock" of defence in Europe.
The Prime Minister has told a Brussels summit that there can be no question of British support for proposals from Baroness Ashton and the European Commission for the EU to run its own military.
"It makes sense for nation states to co-operate over matters of defence to keep us safer," he said. "But it isn't right for the European Union to have capabilities, armies, air forces and all the rest of it. We need to get that demarcation right."