The execution of Iranian-Swedish political activist Habib Asyud has been condemned by the government in Sweden.

The Swedish Foreign Ministry summoned Iran’s deputy ambassador to Stockholm over the hanging on Saturday morning of the dual-nationality opposition figure.

Asyud, former leader of the Arab Struggle Movement for the Liberation of Ahwaz (ASMLA), had been convicted of leading an Arab separatist group accused of attacks including one on a military parade in 2018 that killed 25 people.

He was sentenced to death for being "corrupt on earth", a capital offence under Iran's strict Islamic laws.

The Swedish foreign ministry said in a statement that the death penalty is an inhumane punishment, and Stockholm condemns it along with other European Union countries.

Asyud, 49, was put on trial by a revolutionary court in Tehran in December. He was not allowed to choose his own defense attorney and was represented in his trial by a court-appointed lawyer. He was also forced under duress to make self-incriminating confessions.

Iranian authorities say he was found guilty for leading ASMLA (Harakat al-Nidal in Arabic), a movement which advocates the separation of southwestern Khuzestan Province and for plotting "numerous bombings and terrorist operations" in the oil-rich province with a large Arabic speaking population.

Iran's relations with Sweden have been strained since July 2022 when a Swedish court sentenced a former Iranian jailor, Hamid Nouri, to life imprisonment over executions of political prisoners in 1988.

Iran's foreign ministry spokesman Nasser Kanani in a statement “strongly condemned” the Swedish court’s “politically-motivated and unacceptable” verdict against Nouri, saying the Stockholm government would be responsible for the damage the verdict would cause in bilateral relations.