(CNN) The UN Security Council rejected a US proposal to extend the conventional weapons embargo on Iran Friday.

With the failure of the resolution, the US is now poised to move to unilaterally trigger snapback sanctions on Tehran -- despite having walked away from the Iran nuclear deal in 2018 -- a potential action that has drawn skepticism and alarm from allies and that experts have warned could spell the end of the landmark agreement.

US Ambassador to the UN Kelly Craft said in a statement Friday the US "has every right to initiate snapback of provisions of previous Security Council resolutions" and "in the coming days, the United States will follow through on that promise to stop at nothing to extend the arms embargo."

The US only drew support for the proposal from the Dominican Republic. Russia and China were opposed while Germany, France, the United Kingdom and eight others abstained.

"The United Nations Security Council is charged with the responsibility of maintaining international peace and security. It failed today to uphold its fundamental mission set," US Secretary of State Mike Pompeo said in a statement Friday.

Under the terms of the 2015 Joint Comprehensive Plan of Action (JCPOA), the conventional weapons ban on Iran is legally set to expire in mid-October. For months, the Trump administration has sought to extend the embargo despite having exited the deal -- a campaign that was predicted to fail >>>