Brent crude drops as much as 1.6 percent, while key stock indices in Japan, South Korea and Taiwan climb.

Oil prices have dropped following the United States and Iran’s signing of an interim peace agreement, resuming a slide interrupted by US President Donald Trump’s warning that he could restart his military campaign.

Brent crude fell as much as 1.6 percent on Thursday morning in Asia, returning the international benchmark to almost exactly where it was 24 hours previously.

Brent futures for delivery in August stood at $78.23 as of 04:00 GMT, only about 7 percent higher than before the US and Israel launched their war on Iran on February 28.

After several days of declines, Brent briefly spiked above $81 a barrel on Wednesday after Trump warned that the US could “go right back to dropping bombs” on Iran if it doesn’t “behave”.

Asia’s main stock markets opened higher on Thursday on renewed optimism for an end to nearly four months of disruption to global energy supply chains.

Japan’s benchmark Nikkei 225 rose 1.9 percent in early trading, hitting an all-time high.

South Korea’s Kospi gained more than 1 percent, while Taiwan’s Taiex rose about 1.3 percent.

Hong Kong’s Hang Seng Index bucked the trend, dropping 1.7 percent.

US stock futures, which are traded outside of regular market hours and often foreshadow the next day’s performance, climbed, with those tied to the benchmark S&P 500 and the tech-heavy Nasdaq Composite climbing about 0.8 percent and 1.3 percent, respectively.

Pakistani Prime Minister Shehbaz Sharif, who mediated the negotiations between Washington and Tehran, said on Wednesday that the US-Iran memorandum of understanding (MoU) had entered into force with “immediate effect”.

Sharif said Iran would “instantly reopen” the Strait of Hormuz and the US would “immediately” lift its naval blockade of Iranian ports, though it was not immediately clear if the announcement had any effect on boosting maritime traffic in the critical waterway.

Shipping in the strait has been reduced to a fraction of peacetime levels due to the threat of Iranian missiles, drones and mines, as well as the US blockade.

While more than 500 vessels are estimated to be waiting to exit the Gulf through the strait, shipping companies have expressed concern about the lack of clarity on how to ensure the safety of their vessels and crews in the channel.

In a statement earlier this week, the Baltic and International Maritime Council (BIMCO), one of the world’s largest associations for shipowners, said the US and Iran had yet to provide information about “key aspects such as timings and safe routes”.

“Due to lack of details and a history of overly optimistic reassurances, we believe the security situation for the shipping industry remains volatile, and we still consider it very risky for ships to commence transits at this point,” Jakob Larsen, chief safety and security officer at BIMCO, said in a statement on Monday, responding to the initial announcement of the MoU.

“We advise shipowners to continue doing thorough risk assessments and appeal to all parties to put the safety of seafarers first.”