UK condemns 'barbaric' execution of British-Iranian nationalLONDON, Jan 14 (Reuters) - Britain on Saturday called the execution by Iran of British-Iranian national Alireza Akbari a barbaric act, and imposed sanctions on Iran's prosecutor general in response.The Iranian judiciary's Mizan news agency had earlier reported the execution of the former Iranian deputy defence minister who had been sentenced to death on charges of spying for Britain."I am appalled by the execution of British-Iranian citizen Alireza Akbari in Iran," British Prime Minister Rishi Sunak said on Twitter."This was a callous and cowardly act, carried out by a barbaric regime with no respect for the human rights of their own people."Britain later said it had imposed an asset freeze and travel ban on Mohammad Jafar Montazeri, Iran's prosecutor general, "because he is and has been responsible for, engaging in, providing support for and promoting serious human rights violations in Iran"."