NATO has opened its doors to the east, inviting the Czech Republic, Hungary, and Poland to join while affirming that membership would remain open to all qualified European countries.

But its members have yet to agree on what the organization should do in the modern world. Should its primary purpose remain to defend the territory of its members against direct attack? Or should the Atlantic Alliance focus on security and stability, upholding the rule of law? An alternative would be for NATO extend its reach both geographically and functionally.