During a meeting with Minister of Defence of Ukraine General of the Army of Ukraine Stepan Poltorak in Brussels NATO Secretary General Jens  Stoltenberg commented the Ukraine’s prospects to join NATO, ‘Open Door  Policy - a key principle of NATO - is valid for Ukraine and for other nations. I think it’s a historical event that Minister of Defence of Ukraine Stepan Poltorak is the first Minister from partner nations received in a new office of the NATO HQ’.