MOSCOW — Russia spoke out strongly Monday against the US push for modifying a nuclear agreement with Iran, while Germany said it would seek more detail on what the United States wants and analyze the situation with its European partners.
Russian Foreign Minister Sergey Lavrov warned that Moscow won’t support the US demand for changes in the 2015 nuclear deal with world powers that saw Iran accept curbs on its nuclear program in exchange for lifting international sanctions.
President Trump on Friday kept the accord alive by extending sanctions waivers, but warned that the United States would pull out of the deal in a few months unless ‘‘terrible flaws’’ in the deal are fixed.
Lavrov called the new US demands to Iran ‘‘deplorable,’’ saying they raise doubts about Washington’s ability to observe international agreements.
He particularly noted that the dismantling of the Iran nuclear deal would discourage North Korea from negotiating any future agreement to abandon its nuclear and missile programs.
‘‘We will not support what the US is trying to do — to change the text of the agreement to include things which are absolutely unacceptable for Iran,’’ Lavrov said at a news conference in Moscow.
Trump said he would work with European allies to remove so-called sunset clauses that allow Iran to gradually resume advanced nuclear activities in the next decade. He paired Friday’s concession with other, targeted sanctions on Iran for human rights abuses and ballistic missile development.
Iran warned Saturday that it won’t accept any changes to the nuclear deal. The Europeans have indicated they are willing to discuss the matter with Washington, but have shown little enthusiasm with Trump’s hard line.
German Chancellor Angela Merkel’s spokesman, Steffen Seibert, stressed Monday that Berlin stands by the nuclear deal. He said that Germany would analyze the situation with its European partners.
German Foreign Ministry spokeswoman Maria Adebahr said officials would sit down with the Americans and ‘‘see what goal and request exactly Mr. Trump’s comments contain.’’ She said that Trump’s statement appeared to have been directed ‘‘first and foremost to his own Congress.’’
The 2015 nuclear pact with Iran involved the United States, Britain, France, Germany, China, and Russia.
Iran’s Foreign Ministry said Saturday that it would not agree to any changes to the nuclear deal, and it vowed a ‘‘serious response’’ to new US sanctions that it said crossed a red line.
A day earlier, Foreign Minister Mohammad Javad Zarif tweeted that the nuclear deal is ‘‘not renegotiable,’’ and demanded the United States live up to its own commitments under the agreement — ‘‘just like Iran.’