On 23 June 2016, the Brexit Referendum resulted in a vote in favour of the United Kingdom leaving the European Union. Since the UK and France were the largest military powers within the EU, this would mean a serious reduction in forces available for common European defence. On 28 June, High Representative Federica Mogherini presented a new plan, the Global EU Strategy on Security and Foreign Policy, for rigorous further European military integration between the EU member states. These included more cooperation when planning missions, training and exercising soldiers, and the development of a European defence industry. For the EU Battlegroups specifically, the plan aims to remove the obstacles preventing their rapid deployment, such as the lack of a European military headquarters. Although stressing that NATO will remain the most important defence organisation for many EU countries, Mogherini stated that the Union should be able to operate 'autonomously if necessary' on security matters. Referring to the EU's diplomacy and development record, she said that 'Soft power is not enough', and that in a less secure world, especially after Brexit, common action was needed more than ever.