“Iran effectively shuttered the crucial waterway in the early days of the war and in mid-April the US responded by imposing its own blockade on Iranian ports.”

“Iran's foreign ministry said on Monday that Tehran was collecting fees for "navigational services" on ships transiting the strategic Strait of Hormuz, but is not imposing tolls.”

“Last week, Iran published a map claiming regulatory control over a stretch of the Strait of Hormuz that extends deep into the territorial waters of the United Arab Emirates and Oman”

“five Gulf states to formally warn shipping companies through the International Maritime Organisation (IMO) not to comply.”

“Iran's Persian Gulf Strait Authority defined its claimed management zone as running from Kuh-e Mobarak in Iran to the south of Fujairah in the UAE at the strait's eastern entrance, and from the end of Qeshm Island in Iran to Umm al-Quwain in the UAE at its western entrance.”

“All vessels transiting the defined area are required to obtain prior authorisation from the PGSA.”