In today’s newsletter: Plaid Cymru, the SNP and Sinn Féin have signed an agreement for greater powers, as pressure grows on Westminster over the UK’s future

Good morning. Back in May, the shape of British politics shifted dramatically. I’ll forgive you if you were too preoccupied refreshing Andrew Sparrow’s live blog for the latest speculation about Keir Starmer to notice, but since 7 May, centre-left nationalist parties that ultimately aspire to leave the UK have been in government for the first time simultaneously in Scotland, Wales and Northern Ireland.

This week sees the initial codification of that shift. In Cardiff yesterday, Plaid Cymru leader Rhun ap Iorwerth, Scottish National party leader John Swinney and Sinn Féin vice-president Michelle O’Neill (who shares power with the Democratic Unionist party) affirmed their countries’ right to seek independence from the UK. Along with the leader of the opposition in Ireland, Mary Lou McDonald, they signed a memorandum of understanding that called on Westminster “to prepare, plan and facilitate constitutional change in Wales, Scotland and Northern Ireland”. And they posed for a fair number of group photos too.

Reform UK | Andy Burnham’s government could thwart Reform’s unprecedented £72m donations with retrospective restrictions on political donors that will include tough new residency requirements, ministers have announced.

AI | Donald Trump has dismissed calls to increase controls on AI as a “sick conspiracy”, as stocks linked to the technology slumped after appeals from Anthropic, OpenAI and SpaceX leaders on the weekend for the industry to slow down.

Nato | Nato fighter jets shot down a drone over Lithuania after an alert was issued in the ‌capital and surrounding region, while Poland scrambled fighter jets less than a day after retrieving a suspected Russian drone adrift in its waters.

Middle East | Yemen’s Houthi rebels have seized two strategic islands in the Red Sea, reinforcing the Iran-backed group’s ability to control a key shipping route, as concerns mount that the world is facing a new oil supply crisis.

Lucy Letby | Two leading experts have quit Lucy Letby’s defence team over concerns about the “scientific credibility” of some of its evidence.