On 24 March 2014 , Canadian Prime Minister Stephen Harper led the rest of the G7 partners at an ad-hoc meeting during the Nuclear Security Summit in The Hague to suspend Russian membership , partially , said Harper , because Russia had violated the Budapest Memorandum . He said that Ukraine had given up its nuclear weapons " on the basis of an explicit Russian guarantee of its territorial integrity . By breaching that guarantee , President Putin has provided a rationale for those elsewhere who needed little more than that already furnished by pride or grievance to arm themselves to the teeth . " Harper also indicated support for Ukraine by saying he would work with the new Ukrainian government towards a free trade agreement . Harper was subsequently defeated in the federal election of October 15 , 2015 , and resigned as leader of the Conservative Party
Nuclear Security Summit
2014 Nuclear Security Summit
Budapest Memorandum on Security Assurances