Iran and Western sanctions

The Iran nuclear deal was an agreement reached in 2015 by the Islamic Republic of Iran and the UN. It began with a joint plan of action, the Geneva interim agreement, which was signed by the UN security council and Germany and consisted of a short term freeze of portions of Iran’s nuclear program in return for a reduction of sanctions.
Sanctions were placed on Iran in 1979 which involved the freezing of 12 billion US dollars worth of Iranian assets, but were lifted according to reports, after a group of students invaded the US embassy in Tehran, taking staff hostage. Ronald Reagan introduced new sanctions in 1987 due to conflict in the Persian Gulf which holds massive oil reserves. In 2016 it was estimated to contain 55% of the world’s oil. It is home to Saudi Aramco, formerly Arabian-american oil company, who own one of the richest oil reserves in the world. Persian Gulf states are Iisted as Iran, Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain and the United Arab Emirates:
Britain and Russia invaded Iran in 1941, during the second world war, on the pretext that Iran was supporting nazism, but Iran did not support antisemitism and Iranian embassies in European capitals occupied by Germans, rescued over 1500 Jewish people, granting them citizenship and allowing them to move to Iran.
Tensions between the UK and Iran have been strained since 1931 when Reza Khan, the King of Iran, cancelled an agreement that only allowed Iran 10-16% of the profits of the Abadan refinery, founded as the Anglo-persian oil company in 1909, and marketed as BP, formerly British Petroleum.
BP was founded in 1909 by William Knox-D’Arcy who had a history of mining in Australia and New Zealand. He made his fortune with the Mount Morgan gold mining company, primarily in Queensland and in Matakanui and Central Otago, New Zealand. He was director and major shareholder. At one point, having shares worth more than 613 million pounds in present day terms. In 1901, reportedly with the help of the British government, he secured a 60 year mining concession in Iran. The area specified covered the whole country except five provinces bordering Russia.
BP began as a subsiduary of the Burmah Oil company which was established to develop oil fields in Burmah, India. A court case in 1942, concerning the destruction of oil fields by British forces, was brought by Burmah Oil, eventually leading to a ruling that the company was to be partially compensated, but in the end a law was passed which retroactively exempted the crown from damage.
Reza Khan was king of Iran from 1925 until he was deposed by the Anglo-soviet invasion in 1941. He died three years later. There is a surviving letter he wrote to his son, Mohammad Reza, who continued to rule to some degree, until the Iranian revolution in 1979 overthrew the monarchy, resulting in the migration of many Iranians to western destinations.
The Islamic Republic of Iran was formed in April 1979, under Ayatolla Khomeini, and was the beginning of a new theocratic government whose motto was, neither east nor west.
Iran is reported to subjugate women; but internationally Iranian contingents have been active in Syria, Yemen and other areas in crisis such as Gaza.
In 2018 new sanctions were imposed on Iran, including shipping restrictions; this being the prohibition of Iranian oil tankers, one of which was hijacked by the UK recently. This occurred because trade embargoes were partially lifted due to an agreement. In reality though, the situation regarding Iran and western sanctions doesn’t seem to have changed much. Atleast the UK are not sticking to the agreement.