Now the Iran nuclear deal. A strong response from Tehran, vowing retaliation against the new sanctions imposed by the United States. And some diplomatic reassurance from China. CGTN's Toby Muse reports.

Iran says its nuclear deal won't be changed, a rebuke to President Donald Trump's claim that the U.S. will pull out unless the agreement is drastically altered.

Referring to the nuclear deal by its acronym, Iran said: "it will not take any measures beyond its commitment to the JCPOA, nor will it accept changes to this agreement now or any time in the future."

Tehran also reacted angrily to U.S. sanctions slapped on 14 Iranian officials and entities. Those sanctions were put on Iran following alleged human rights abuses in repressing protests across Iran against a stagnant economy. Iran's foreign ministry said the new sanctions crossed a red line.

The Iranian foreign ministry also rejected Trump's idea to tie the nuclear deal to additional restrictions on Iran's long-range ballistic missile program.

Iran's foreign minister took to twitter to say: The "U.S. must bring itself into full compliance -just like Iran."

On Friday, Trump extended waivers of sanctions as part of an agreement to limit Iran's nuclear program. But Trump said he would be talking to European allies to remove parts of the deal that are set to expire in the next 10 and 15 years. Meanwhile, most countries have said that they accept the deal as it is.

Chinese foreign minister Wang Yi spoke with Iran's foreign minister over phone and pledged to support and implement the deal. He said the agreement was necessary to prevent nuclear proliferation. Russia criticized Trump's comments. Germany and France have all called for the deal to be implemented as it was negotiated back in 2015. But let's remember that during the 2016 presidential campaign, Trump called this deal the "worst ever". Toby Muse, CGTN, Washington.