China said on Tuesday it regrets Iran's decision to exceed a limit on enriched uranium reserves under a 2015 nuclear deal, but said US "maximum pressure is the root cause" of tensions.
Iran said Monday it had made good on its warning that it would breach the limit, prompting US President Donald Trump to warn that Tehran was "playing with fire".
The United States withdrew from the nuclear deal last year and hit Iran's crucial oil exports and financial transactions as well as other sectors with biting sanctions. Tehran, which has sought to pressure the remaining parties to save the deal, announced on May 8 that it would no longer respect the limit set on its enriched uranium and heavy water stockpiles.
It threatened to abandon further nuclear commitments unless the remaining partners — Britain, China, France, Germany and Russia -- helped it circumvent sanctions, especially to sell its oil.
