A senior U.S. arms control official said on Tuesday that Iran's missile program is destabilizing the Middle East and increasing the risk of a "regional arms race".
Yleem Poblete, Assistant Secretary of State for Arms Control, Verification and Compliance, told the U.N.-sponsored Conference on Disarmament that Washington would aggressively counter "Iran's regional proliferation of ballistic missiles and its unlawful arms transfers".
She urged "all responsible countries" to enforce United Nations Security Council resolutions restricting the transfer of missile-related technologies to Iran.
President Donald Trump's administration has made Iran's missile program a centerpiece of its tough policies toward Tehran.
By withdrawing from the 2015 nuclear agreement with Iran and reimposing sanctions, Washington has cited the development of ballistic missiles as one of the decisive factors in its decision.