EU is threatened with collapse due to migration crisis and the likely withdrawal of UK from the EU. This opinion was expressed by President of the European Council Donald Tusk.
EU leaders hope to agree a deal on reforming the EU at the summit this week.
British Prime Minister David Cameron arrived in Brussels to discuss possible changes in the EU. He said, if we can agree on reform, Britain can stay in the EU.
A referendum on the issue should take place in the United Kingdom by the end of 2017.
