Early on the 18th Beijing time, US and Iranian officials confirmed their presidents signed a memorandum of understanding. Some Iranians said they doubted the US would comply, citing past breaches and warning the memorandum may not produce lasting calm; others said they had little expectation of implementation and feared the US could launch further attacks.

Hezbollah said on June 19 it will continue resisting Israeli military operations in southern Lebanon’s Taibnit–Ali Tahir area, reporting an exchange of fire with an Israeli unit attempting to infiltrate north of Ali Tahir and a subsequent strike on an Israeli reinforcement. The Israel Defense Forces on June 18 released a map of a so-called southern Lebanon "security zone" that places Taibnit and Ali Tahir on the zone’s edge.

Labour’s Burnham won the vacant Makerfield parliamentary by-election by 24,927 votes to 15,696 over Reform Party candidate Robert Kenyon, clearing a path for the Greater Manchester mayor to seek the Labour leadership. The 56-year-old has signalled intent to challenge Starmer but must first secure a Commons seat. Investors are watching for policy risk: if Burnham became party leader he could adopt looser fiscal settings than Starmer and Chancellor Rachel Reeves, market participants say. The pound was little changed near $1.3195 after the result. The outcome could have greater impact when UK gilts open in London morning trade.