Crude oil values declined and stock indexes advanced after the United States and Iran announced a preliminary framework agreement to conclude the conflict, with US President Donald Trump noting that the pact would allow the reopening of the important Strait of Hormuz route for maritime traffic.

Brent crude, the worldwide oil reference, fell 4.7 percent to 83.24 dollars (61.94 pounds) per barrel, and equities across Asia and Europe advanced sharply in response to the news.

Pakistan, which has played a mediating role in ending the US-Iran conflict, indicated that a formal signing event is scheduled for Friday, 19 June in Switzerland.

Iran's deputy foreign minister Kazem Gharibabadi verified during a state television interview that an agreement with the US had been reached, while Trump wrote on social media to encourage the resumption of oil shipments.

Yet Vandana Hari of energy markets analysis firm Vanda Insights observed that insufficient specifics on the terms reached are expected to create market nervousness and doubt.

This situation may lead to several days of instability and price swings in the oil sector, she noted.

The Strait of Hormuz has remained largely shut since the US and Israel began airstrikes against Iran on 28 February.

Following the outbreak of hostilities, Tehran warned it would target ships transiting the essential passage, which normally carries about 20 percent of global oil and liquefied natural gas supplies.

LIVE: Track market response to the framework agreement between Iran and the US

Worldwide energy markets have experienced sharp fluctuations in recent months, with values moving quickly up or down based on events in the US-Israel conflict involving Iran.

Brent crude, which stood near 70 dollars per barrel prior to the fighting, reached roughly 120 dollars at its peak during the war.

Asian equity markets rose strongly on Monday as investors reacted positively to the framework agreement. Japan's Nikkei 225 index finished 5 percent higher, and South Korea's Kospi gained 5.2 percent.

The area suffered notably from elevated energy expenses due to its heavy dependence on Middle Eastern sources for oil and LNG deliveries.

In Europe, Germany's Dax and France's Cac 40 both increased around 1.7 percent, while London's FTSE 100 advanced 0.6 percent.

Energy sector specialists have cautioned that oil transit through the strait is unlikely to resume at pre-conflict volumes right away.

Andrew Lipow of consulting firm Lipow Oil Associates explained that mines must first be removed from the channel, a process that may require anywhere from several weeks to six months.

He added that a significant number of tankers are queued to transit the route and that restoring oil output along with normalizing ship loadings could require additional weeks.

Admiral Mark Montgomery, a former US Navy rear admiral and senior fellow at the Foundation for the Defence of Democracies, told the BBC's Today programme that a return to regular operations would not happen immediately.

"I would say that's going to take a month or 45 days to kind of fully get till you're at a normal pumping balance, and vessels moving in and out smoothly," he said.