The United States on Sunday blamed the failure of a U.N. nuclear nonproliferation treaty conference on countries that did not support its stance on Iran. File Photo by John Angelillo/UPI | License Photo

May 24 (UPI) -- The United States on Sunday blamed the collapse of a U.N. nuclear nonproliferation conference on what it called some countries' inability to take Iran's threat to global nonproliferation seriously.

The nearly monthlong Review Conference of the Parties to the Treaty on the Nonproliferation of Nuclear Weapons ended Friday without consensus on an outcome document, which reviews implementation of the Cold War-era pact and sets recommendations and commitments for its 191 state parities.

Conference President Do Hung Viet of Vietnam said Friday, following weeks of work and four versions of an outcome document, that he would not put it forward for adoption as "the conference is not in a position to achieve agreement on its substantive work."

The failure came amid mounting global insecurity, including the war in Iran, the modernization and expansion of nuclear arsenals and other geopolitical tensions, which complicated efforts to reach consensus.