Russia's War Against Ukraine
OP-ED
Olexander Motsyk: Why Ukraine is rethinking NATO relationship
From left, U.S. Secretary of State John Kerry, U.S. Ambassador to NATO Douglas Lute and Ukrainian NATO Ambassador Ihor Dolhov speak during a foreign ministers meeting at NATO headquarters in Brussels on Dec. 2.
Editor's note: Olexander Motsyk is Ukraine's ambassador to the United States. The views expressed are his own.
(CNN) -- Twenty years ago this month, Ukraine, Russia, the United Kingdom and the United States signed an agreement that represented a major step in global anti-proliferation efforts. Under the deal, known as the Budapest Memorandum, Ukraine voluntarily surrendered the third largest nuclear arsenal in the world, which it had inherited after the collapse of the Soviet Union.
