Oil prices fell below $100 a barrel amid growing optimism about potential diplomatic progress between the United States and Iran, while global equity markets responded positively to the news. Brent crude, the international benchmark, declined 4.3% to close at $99.38 per barrel on Monday, reversing recent gains tied to Middle East tensions.

The decline followed remarks from President Donald Trump expressing openness to a meeting with Iranian President Pezeshkian, who is slated to attend the United Nations General Assembly in New York this week. Analysts noted that the Iranian delegation’s planned in-person attendance and reported willingness to engage with U.S. counterparts could pave the way for renewed negotiations aimed at resolving the ongoing conflict involving Iran.

Markets were further buoyed by increased Saudi Arabian oil shipments through the Strait of Hormuz, a critical chokepoint for global energy supplies. Data from JP Morgan revealed that Saudi shipments averaged 2.9 million barrels per day last week, a significant rise compared to just 700,000 barrels daily in August. This uptick suggests an easing of supply concerns that have previously driven oil prices higher.

Despite these signs of potential diplomatic thaw, fighting in the Middle East continues. Yemen’s Iran-backed Houthi rebels claimed responsibility for attacks on Riyadh and a Saudi Aramco facility. Meanwhile, China has reportedly requested Iran’s assistance in curbing Houthi activities following a formal appeal from Saudi Arabia. Observers described China’s involvement as notable given its prior reluctance to intervene in the conflict, interpreting this move as possible evidence of Beijing’s frustration with Tehran’s stance and a reflection of the broader economic impact associated with disrupted crude supplies.

Investor sentiment extended beyond commodities, with major global stock indices posting gains. The FTSE 100 and FTSE 250 in London rose alongside U.S. markets, supported in part by strong performances from artificial intelligence-related companies. European equities also advanced, with the Stoxx Europe 50 recording its largest one-day increase since July, up 1.06%.

In fixed income markets, yields on 10-year UK government bonds (gilts), which influence borrowing costs, eased slightly to 5.21% after having recently touched near two-decade highs. U.S. Treasury yields similarly declined. Meanwhile, bitcoin saw a notable rally, climbing 6.3% to surpass $85,000, marking its highest level since the conflict in the Middle East began earlier this year.

Overall, improved prospects for U.S.-Iran dialogue, coupled with signs of stabilizing oil flows and subdued geopolitical risks, contributed to a more positive environment across multiple financial markets. However, the situation remains fluid, with ongoing regional hostilities underscoring the potential for renewed volatility.