Iran has signaled that it is open to talks about its nuclear program with the United States if they are restricted to military concerns, a day after the country’s supreme leader had appeared to reject an overture from President Donald Trump to hold discussions.

“If the objective of negotiations is to address concerns vis-a-vis any potential militarization of Iran’s nuclear program, such discussions may be subject to consideration,” Iran’s mission to the United Nations said in a social media post Sunday.

It was unclear if the comments represented a shift in policy after Ayatollah Ali Khamenei, Iran’s supreme leader who has ultimate authority in such matters, issued an angry statement following Trump’s offer last week to restart talks.

In a social media post Saturday, Khamenei decried “bullying governments” that seek to impose restrictions on Iran. The remarks did not refer directly to Trump or his offer. The president had warned that Iran would have to choose between curbing its nuclear program or risk losing it in a military attack

Experts say Iran is at the threshold of being able to enrich enough uranium to produce a nuclear weapon. The Islamic republic says its nuclear program is for peaceful purposes.

Iran’s U.N. mission said that “negotiations will never take place” if their aim is to dismantle Iran’s “peaceful nuclear program.”

The apparently conflicting remarks may reflect a split among Iranian officials about whether to reenter talks after Trump, during his first term as president, withdrew the United States from the nuclear deal struck with Iran by his predecessor, Barack Obama.

Some moderate and reformist Iranian leaders, including President Masoud Pezeshkian, who took office last year, have said they want to begin discussions. Khamenei, however, has the final say and has said that Iran cannot trust the United States.

Trump’s offer comes as the strategic environment for Iran has deteriorated substantially.

Israel has severely weakened Iran’s regional proxies, Hezbollah and Hamas, and destroyed almost all the air defenses protecting Iran’s nuclear facilities. In December, a rebel coalition toppled Syria’s former authoritarian ruler, Bashar Assad, an ally of Tehran.

Trump’s overture comes as both Israel and the United States have warned they will never let Iran acquire a nuclear weapon, leading to fears of a military confrontation as Tehran enriches uranium at near weapons-grade levels — something only done by atomic-armed nations.

Tehran has long maintained its program is for peaceful purposes, even as its officials increasingly threaten to pursue the bomb. Tensions are high with the U.S. over its sanctions and with Israel as a shaky ceasefire holds in its war against Hamas in the Gaza Strip.

The Iranian statement Sunday, while allowing for talks on concerns about militarization, stressed that Tehran would not negotiate away what it stresses is its peaceful nuclear program.

“However, should the aim be the dismantlement of Iran’s peaceful nuclear program to claim that what Obama failed to achieve has now been accomplished, such negotiations will never take place,” Iran’s mission said.