Woofun AI reports that technical-level diplomatic engagements between the United States and Iran resumed in Switzerland on June 21, following the formal signing of a memorandum of understanding on June 18. The Iranian delegation has arrived in Geneva, joined by US Vice President Vance, to advance discussions initiated after Pakistan's announcement on June 20.

Concurrently, geopolitical tensions escalated as the Iranian military declared the closure of the Strait of Hormuz on June 20, citing Israeli military actions and alleged US violations of the recent agreement. The US military subsequently disputed this claim, stating no actual closure measures were observed.

Additionally, US President Trump disclosed specific details regarding toll collection protocols for transit through the strait on the same day.