Global oil markets sharply reversed course Monday after the United States and Iran announced a tentative agreement aimed at ending months of conflict and reopening the Strait of Hormuz, a critical shipping route that carries roughly one-fifth of the world's oil supply. The prospect of restored energy flows immediately eased fears of prolonged supply disruptions, sending crude prices sharply lower.

Brent crude, the international benchmark, fell more than 5% in early trading and slipped below $83 a barrel, while West Texas Intermediate dropped to just above $80. The decline followed President Donald Trump's announcement that negotiators had reached a preliminary framework agreement, with a formal signing expected later this week in Switzerland.

The market reaction underscored how heavily energy prices had been influenced by concerns surrounding the Strait of Hormuz. Since fighting escalated earlier this year, traders had priced in the possibility of prolonged shipping disruptions through the narrow waterway connecting the Persian Gulf to global markets.

President Trump framed the agreement as a breakthrough not only for the region but also for international energy security.

"This Great Deal will bring Peace and Security to the whole Region. Many presidents have tried to make Peace with Iran, and all have failed before me. The Leaders of the Region have, for the first time, found a President who can help them achieve real Peace. With the opening of the Strait upon the signing of the Deal on Friday, for purposes of mine removal, oil will flow on both ends again for the Region, and the World!" Trump said in a social media post Sunday.

According to Pakistani Prime Minister Shehbaz Sharif, the agreement is expected to be formally signed in Switzerland this week. However, several important details remain unresolved, and officials on both sides have cautioned that implementation will not begin until the final document is completed.

The Associated Press reported that negotiators will hold preparatory meetings in Qatar before the signing ceremony. Citing a source familiar with the talks, the report said American and Iranian officials are still working through operational and diplomatic details necessary to move the agreement from principle to practice.

Iranian officials have also signaled that implementation remains contingent upon the final signing. Iran's Deputy Foreign Minister Kazem Gharibabadi stated that Tehran would not begin carrying out the agreement before formal ratification.

The agreement arrives after more than three months of disruption that rattled energy markets and intensified concerns about inflation, fuel costs and global supply chains. Analysts have closely monitored developments in the region because even temporary interruptions in Hormuz traffic can affect oil prices worldwide.

Despite the market's optimistic response, several geopolitical flashpoints remain unresolved. One of the most immediate concerns involves Lebanon, where Israel continues military operations against Hezbollah, a group backed by Iran.

Israeli Defense Minister Israel Katz said Monday that Israel would not withdraw from territory seized during fighting in Lebanon. A spokesman for Prime Minister Benjamin Netanyahu's office reiterated that Israel would continue acting against perceived security threats.