European natural gas futures were up on Monday after the US and Iran failed to reach an agreement on a framework for a peace deal, keeping tensions in the region elevated.
The front-month Dutch TTF contract rose 0.90% to 44.54 euros ($52.47) per megawatt-hour and the front-month UK NBP contract gained 0.59% to 108.75 British pence ($1.48) per therm.
In a Truth Social post on Sunday, US President Donald Trump said that Iran's response to a US-backed ceasefire proposal was "totally unacceptable," without specifying any additional details.
Tehran's proposal reportedly focused on bringing an end to hostilities in the region first, before addressing other pressing concerns, according to the state news agency, Tasnim News, on Sunday, citing an unnamed government official familiar with the matter.
A spokesperson for the Iranian Foreign Ministry, Esmaeil Baqaei, said in an interview with Press TV that "for now, we have decided to focus on ending the war, because this issue is a matter of concern for the entire region, for our nation, and for the international community."
Meanwhile, the Strait of Hormuz, which usually accounts for one-fifth of global LNG flows, remained effectively closed for the 11th week running, with just five vessels transiting over the past 24 hours, according to the Hormuz Strait Monitor.
Despite the latest diplomatic development, the rally in European gas prices has been limited, which, according to Daniel Hynes, a senior commodity strategist at ANZ, is due to both Qatar and the Abu Dhabi National Oil Company managing to get some supplies through the Strait after taking various precautions.
Hynes also noted that technical issues with Japan's Kansai Electric Power's Mihama No. 3 nuclear reactor could lead to increased reliance on LNG for electricity generation during a period of significant supply constraints.
All of this comes at a critical juncture for European markets, with refilling of inventories in full swing, but from depleted levels, at just 35.05% of capacity, compared to 42.16% during the corresponding period a year ago, according to Gas Infrastructure Europe.