TEHRAN — Iran’s highest leader repeated warnings on Wednesday against further negotiations with the United States after the nuclear agreement the countries reached in July. Such talks are “forbidden,” the supreme leader, Ayatollah Ali Khamenei, told an audience of Revolutionary Guards commanders.

Iran’s leader, widely seen as both the architect and arbitrator of the agreement, also offered veiled criticism of Iran’s nuclear negotiating team, saying that its members had been alert, but that the opposite parties “had found chances” and made “damaging moves against Iran’s national interests” in the talks. He did not elaborate.

Ever since the deal was concluded, Ayatollah Khamenei has given speeches against additional cooperation with the United States, arguing that the country is aiming to infiltrate Iran through negotiations.