Federica Mogherini described the agreement as “the culmination of 12 years of diplomacy facilitated by the European Union” and endorsed by United Nations Security Council Resolution 2231.
“At a time of acute nuclear threats the European Union is determined to preserve the JCPOA as a key pillar of the international non-proliferation architecture," she said in Luxembourg on Thursday.
“The European Union is committed to the continued full and effective implementation of all parts of the JCPOA. The European Union underlines that the lifting of nuclear related sanctions has a positive impact on trade and economic relations with Iran,” she added.
Elsewhere in her remarks, the EU's top diplomat said the EU “encourages” Washington to maintain its commitment to the JCPOA.
The JCPOA stands for the Joint Comprehensive Plan of Action, as the nuclear deal reached between Iran and the US, Russia, China, France, Britain, and Germany is officially called.
Under the deal, Iran undertook to apply certain limits to its nuclear program in exchange for the termination of all nuclear-related sanctions against Tehran.
Donald Trump, who rose to the US presidency a year after the implementation of the deal had begun, has opposed it.
Trump refused to certify Iran’s compliance with the terms of the nuclear accord under a domestic American law, kicking a decision to Congress over whether to restore sanctions against the Islamic Republic.