EU chief Ursula von der Leyen on Monday praised British Prime Minister Keir Starmer for bolstering "European" security after he announced his resignation.

The Observer newspaper said Prime Minister Keir Starmer concluded his position was no longer tenable after speaking to Cabinet ministers, advisers, donors and trade union leaders.

The Observer newspaper said Starmer had concluded that his position was no longer tenable after speaking to cabinet ministers, advisers, donors and trade union leaders.

British prime minister Keir Starmer is expected to announce his resignation on Monday and outline a timetable for his departure, The Observer reported on Saturday.