Iran’s President Masoud Pezeshkian on Tuesday vowed to match any US move to return to a June deal aimed at ending their war, as he prepares to meet his Russian counterpart Vladimir Putin at a regional summit.

The two allies were due to hold talks on the sidelines of the Shanghai Cooperation Organisation summit in Kyrgyzstan, a bloc promoted by Russia and China as an alternative to Western power.

“I state explicitly that if the United States returns to its commitments under the aforementioned Memorandum of Understanding, the Islamic Republic of Iran will immediately take reciprocal action,” Pezeshkian said, according to the Iran presidency’s website.

The memorandum aimed at ending hostilities between Tehran and Washington that began in late February, with US and Israeli attacks on Iran that killed former supreme leader Ayatollah Khamenei.

The deal, meant to set the stage for final peace talks, later collapsed, with both sides accusing each other of violating its terms.

Pezeshkian’s remarks came as the Strait of Hormuz remained a key point of contention between Iran and the US, which resumed exchanging fire on Monday after more than a month of relative calm.

Tehran has maintained its closure of the strategic waterway, while saying it would return to its commitments under the June deal, which included reopening Hormuz, if the United States did the same.

On Monday, Iranian Foreign Minister Abbas Araghchi also urged the US to “return to its commitments and to what their president signed.”

“In that case, everything can be put back on the right track,” he said.