TEHRAN   -   As tensions with the US mount, Iran’s supreme leader has said the country’s president and foreign minister didn’t act as he wished in implementing the 2015 nuclear deal with world powers.

The comments Wednesday night, posted on Ayatollah Ali Khamenei’s official website, are the first time he’s blamed both President Hassan Rouhani and Foreign Minister Mohammad Javad Zarif by name in his concerns about the deal.

Khamenei said: “In some extent, I did not believe in the way that the nuclear deal was implemented. Many times I reminded both the president and the foreign minister.” Khamenei has final say on all matters of state. His remarks show the internal pressure both Rouhani and Zarif now face amid the US tensions.

A prominent reformist lawmaker in Iran has reportedly said the Islamic Republic “under no circumstance” will enter a war with the US, either directly or through proxy forces. Heshmatollah Falahatpisheh’s comments on Wednesday, reported by the semi-official ILNA news agency, come amid heightened tensions between Tehran and Washington a year after President Donald Trump pulled America from Iran’s nuclear deal with world powers.

Falahatpisheh was quoted as saying that “under no circumstance will we enter a war.” He added: “No group can announce that it has entered a proxy war from Iran’s side.”

That comes as Yemen’s Iranian-allied Houthi rebels have launched drone attacks on Saudi Arabia amid the heightened tensions. The United Arab Emirates also says four oil tankers off its eastern coast were sabotaged.

A senior German diplomat headed Thursday to Tehran to press Iran to continue to respect the landmark nuclear deal, despite the unilateral withdrawal of the US and increasing pressure from Washington. Tensions have soared in the Mideast recently as the White House earlier this month sent an aircraft carrier and B-52 bombers to the region over a still-unexplained threat it perceived from Iran.

In Berlin, the Foreign Ministry said Political Director Jens Ploetner was to hold talks with Iran’s Deputy Foreign Minister Abbas Araghchi on Thursday to try salvage the nuclear deal signed in 2015 in Vienna. The accord has steadily unraveled since the Trump administration pulled America out of the deal, re-imposed and escalated US sanctions on Tehran last year. The German envoy’s visit also follows Iran’s declaration earlier this month that the remaining signatories to the deal — Germany, France, Britain, China and Russia — have two months to develop a plan to shield Iran from American sanctions.

“The situation in the Persian Gulf and the region, and the situation surrounding the Vienna nuclear agreement, is extremely serious,” the German Foreign Ministry said in an e-mail to The Associated Press. “There is a real risk of escalation — including due to misunderstandings or an incident. In this situation, dialogue is very important.”

With Iran’s 60-day deadline, the ministry said there is still a “window for diplomacy to persuade Iran to continue its full compliance” and said Germany remains in close contact with the other nations that have been struggling to keep the deal alive.

The accord, intended to keep Iran from obtaining a nuclear weapon, promised economic incentives in exchange for restrictions on Tehran’s nuclear activities. Despite efforts so far by the others to keep the deal from collapsing, Iran’s economy has been struggling and its currency has plummeted after the re-imposition of US sanctions.

Iran continued abiding by the stipulations of the deal, according to a February report by the International Atomic Energy Agency, though it expressed increasing frustration with the inability of the Europeans to provide economic relief. A new IAEA report is due out soon.