Photo from UNIAN

"That is a recipe, quickly, my friends, for them to walk away from Ukraine, where they are already very dicey and ready to say, 'Well, we have done our bit," Kerry said, referring to efforts of European allies to support the Ukrainian government in its fight against Russian-backed rebels.

Kerry spoke during an Iran nuclear discussion hosted by the Thompson Reuters media company.

The U.S. Secretary of State said it could hurt U.S. foreign policy if Congress ultimately "kills the deal." It was negotiated and backed by the U.N. Security Council's permanent members – Britain, China, France, Russia and the United States – plus Germany, otherwise known as the P5+1.

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"If the United States were to behave that way, not only would we have lost them with respect to the sanctions, we will lose their support if we have to use military action," Kerry said.

In addition, the failure of the agreement in Congress could lead to the weakening of the dollar, according to Kerry.

Congress has 60 days to review the Iran nuclear deal, known as the Joint Comprehensive Plan of Action (JCPOA). The voting on the relevant resolution is scheduled for September 17. Previously, U.S. President Barack Obama warned against the possibility of a new war in the event of the failure of the nuclear deal with Iran.

As UNIAN reported earlier, six major world powers and Iran reached a nuclear deal in Vienna in July in exchange for lifting sanctions.