What is the relationship between EU and European Union in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

BRUSSELS, Aug 30 (Reuters) - European Union ministers have been called to an extraordinary EU meeting on Sept. 14 to discuss a huge surge in irregular immigration, as European leaders struggle to define a coherent response to the crisis.

Answer: operator