NEW DELHI — Iran’s foreign minister said a lack of trust is the biggest obstacle in negotiations to end the war with the U.S., saying Friday that Tehran would be open to diplomatic help, particularly from China, to help ease tensions.

Iranian Foreign Minister Abbas Araghchi said contradictory messages have “made us reluctant about the real intentions of Americans.”

“We are in doubt about their seriousness,” he told reporters in New Delhi, adding that negotiations would move forward if Washington was ready for a “fair and balanced deal.”

U.S. President Donald Trump earlier this week dismissed Iran’s latest formal proposal as “garbage.” While Iran was said to include some nuclear concessions, Trump has said he wants to remove highly enriched uranium from the country and prevent it from developing nuclear weapons. Iran says its nuclear program is for peaceful purposes.

In separate negotiations in Washington between Israel and Lebanon, both sides agreed Friday to extend their ceasefire until early June, U.S. officials said.

With talks between Iran and the U.S. at a standstill during the shaky ceasefire, tensions remain high and threaten to tip the Middle East back into open warfare and prolong the worldwide energy crisis sparked by the conflict.

Iran still has a chokehold on the Strait of Hormuz, a vital waterway where a fifth of the world’s oil passed through before the war, and America is blockading Iranian ports.

Trump and Chinese President Xi Jinping, who finished talks on Friday, agreed the strait needs to be reopened.

China could play a diplomatic role, Iran says

Araghchi said Friday that Iran would welcome diplomatic support from other countries, particularly from China, citing Beijing’s previous role in facilitating the restoration of ties between Iran and Saudi Arabia.

Beijing has shown little public interest in U.S. requests to get more involved, even though Trump told Fox News’ Sean Hannity that Xi had in their conversations offered to help.

Pakistan said Thursday it was continuing diplomatic efforts to help ease regional tensions. But it declined to disclose details of the discussions or say whether the U.S. had formally responded.

“The clock on diplomacy has not stopped. The peace process is working,” Pakistani Foreign Ministry spokesperson Tahir Andrabi told reporters in Islamabad.