Iran's supreme leader Ayatollah Ali Khamenei warned Tuesday against American "deceit," just days after the end of sanctions under a nuclear deal that the central bank said would unblock $32 billion.

The remarks underscored the still-strained relations between Tehran and Washington, which unveiled new missile-linked sanctions against Iran on Sunday almost as soon as the nuclear-related measures were scrapped.

Rouhani wrote to Khamenei on Monday to provide an update after the U.N. atomic watchdog declared Saturday that Iran had met conditions stipulated in the nuclear deal.

Khamenei has never endorsed repairing relations with the US and has largely followed a similar tack to Iran's late leader Ayatollah Ruhollah Khomeini, who dubbed America the "Great Satan".

Iran's economy suffered greatly under the international sanctions that since 2006 targeted the Islamic republic's nuclear program and financial systems.

Iran needs annual foreign investment of $30-$50 billion to reach an eight percent growth target and cash in on sanctions relief, the president said Sunday.

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