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A third round of talks between the U.S. and Iran kicked off in Geneva on Thursday, with Iran under immense pressure to agree a nuclear deal with the States and to curb its nuclear and ballistic missile development programs.

The U.S. has amassed a large military force in the Middle East ahead of the discussions and President Donald Trump warned last week that “bad things” would happen if Iran does not agree to a new nuclear deal.

On the eve of the latest talks in Switzerland, U.S. Secretary of State Marco Rubio warned Iran’s reluctance to discuss its development of intercontinental ballistic missiles was also a significant stumbling block.

“The negotiations [on Thursday] will be largely focused on the nuclear program, and we hope progress can be made ... But it’s also important to remember that Iran refuses – refuses – to talk about ballistic missiles to us or to anyone, and that’s a big problem,” he told reporters Wednesday.