Sign up now for FREE unlimited access to Reuters.com Register BRUSSELS, April 7 (Reuters) – German Foreign Minister Annalena Bairbock said on Thursday she had called on NATO foreign ministers to attend an informal meeting in Berlin in May to coordinate their response to the war in Ukraine. Sign up now for FREE unlimited access to Reuters.com Register Written by Paul Carrel, Edited by Miranda Murray Our role models: The Thomson Reuters Trust Principles.