coming months. In September 2016, both countries restored diplomatic relations to their pre-2011 level, with Nicholas Hopton being appointed British Ambassador in Tehran. British Prime Minister David Cameron and Iranian President Hassan Rouhani met on the sidelines of a United Nations in September 2014, marking the highest-level direct contact between the two countries since the 1979 Islamic revolution. In April 2016, an Iranian-British dual citizen Nazanin Zaghari-Ratcliffe was arrested while visiting Iran with her daughter. She was found guilty of "plotting to topple the Iranian government" in September 2016 and sentenced to 5 years in prison. Her husband led a concerted campaign to have her released maintaining that she "was imprisoned as leverage for a debt owed by the UK over its failure to deliver tanks to Iran in 1979." After her initial sentence expired in March 2021 she was charged and found guilty of propaganda activities against the government and sentenced to one year in prison. She was finally released on 16th March 2022, which was reported to be related to the UK paying a historic debt for tanks paid for by Iran in the 1970s but never delivered. Theresa May, who succeeded Cameron as Prime Minister in July 2016, accused Iran of "aggressive regional actions" in the Middle East, including stirring trouble in Iraq, Lebanon and Syria, and this led to a deterioration in relations In response, Iran's Supreme Leader Ali Khamenei condemned Britain as a "source of evil and misery" for the Middle East. The British intelligence officials concluded that Iran was responsible for a cyberattack on the British Parliament lasting 12 hours that compromised around 90 email accounts of MPs in June 2017. On July 7, 2022, The Royal Navy of Britain reported that one of its warships had arrested smugglers in international waters south of Iran early this year after seizing Iranian armaments, including surface-to-air missiles and cruise missile engines. Tanker detention and Strait of Hormuz tensions On 4 July 2019, Royal Marines boarded the Iranian-owned tanker Grace 1 by helicopter off Gibraltar where it was detained. The reason given was to enforce European Union sanctions against Syrian entities, as the tanker was suspected of heading to Baniyas Refinery named in the sanctions that concern Syrian oil exports. Gibraltar had passed regulations permitting the detention the day before. Spain's Foreign Minister Josep Borrell stated that the detention was carried out at the request of the