The member states adopted Choosing a new `` Strategic Concept '' , the alliance 's new ten-year plan following Motion the expiration of the previous plan adopted Choosing at the 1999 Washington summit .

In addition to accepting Agree_or_refuse_to_act the Strategic Concept that addressed Resolve_problem the alliance 's modern challenges such as terrorism Terrorism and cyber attacks Attack , the members agreed Agree_or_refuse_to_act to develop Coming_to_be a mutual missile defense Defending system .