Iran's foreign ministry spokesman Nasser Kanaani slammed on Monday the UK's hypocrisy in condemning the execution of Alireza Akbari, a British-Iranian spy who worked for the British Intelligence Agency (MI6).

"UK's action in violating the national security of the Islamic Republic of Iran has been met with Iran's decisive intelligence and judicial response," Nasser Kanaani said in a post on his Twitter account on Monday.

"The increased rhetoric of the UK regime and the support of some of the so-called human rights advocates in Europe for London show their lawlessness and violations of based-on-justice laws," he added.

"The British regime, whose royal family member considers the killing of 25 innocent people as the removal of a chess piece and is not ashamed of it, along with those who turn a blind eye to this war crime, are not entitled to preach others about human rights," he concluded.

Read more: UK reconsidering its stance on Iran nuclear deal: Reports

In Prince Harry's memoir "Spare", Harry reportedly admitted that he killed 25 people in Afghanistan, actions which he likened to removing "chess pieces" from aboard.

As a consequence to this, his memoir condemnation from the media, commentators, army veterans, and even the Taliban.

Afghans have taken to the street calling for putting Prince Harry on trial for the people he admitted to killing during the UK occupation of Afghanistan.

Read more: 'Spare' saga continues; Afghans demand putting Prince Harry on trial