Starmer calls for a pivot towards Europe.
Global instability linked to the Iran war is a concern.
Criticism from Trump adds pressure on UK-US relations.
Briefing: 'It's a nightmare for Keir Starmer' as UK PM sees 'special relationship' with US unravel
Strategic angle: UK Prime Minister Keir Starmer emphasizes the need for closer ties with Europe amid global instability and criticism from Trump.