The diplomatic architecture built around Pakistan-mediated US-Iran talks effectively collapsed on April 27 as Iranian Foreign Minister Abbas Araghchi departed for Moscow to meet President Putin — a decisive pivot away from the Washington channel. The shift follows Trump's cancellation of his envoys' planned Pakistan trip over the weekend and Iran's Deputy Parliament Speaker Ali Nikzad publicly declaring the Strait of Hormuz will 'under no circumstances' return to its previous state, citing a direct order from Supreme Leader Mojtaba Khamenei.
The IMO Secretary-General briefed the UN Security Council on April 27, confirming 20,000 seafarers remain trapped in the Gulf, mines are present throughout the strait, and there is 'no safe transit anywhere in the Strait of Hormuz.' The US blockade has now turned back 38 ships from entering or leaving Iranian ports since April 13 (CENTCOM). Brent crude eased to ~$101/bbl intraday after reports of a new Iranian proposal conveyed via Pakistani mediators — markets gave back gains as the proposal's substance proved vague and no formal talks are scheduled.
The Iran-Russia axis engagement is significant: Russia has strategic interest in elevated oil prices and has previously blocked UN Security Council resolutions on Hormuz. If Iran secures Russian diplomatic backing, the leverage available to Western mediators decreases materially. A Trump-Starmer call over the weekend focused on the 'urgent need' to reopen shipping lanes, with Starmer warning of major cost-of-living impacts — but neither country has proposed a mechanism that addresses Iran's core demand: lifting of the US port blockade before nuclear talks resume.