Wagner head says forces to leave Bakhmut next week – as it happened

Yevgeny Prigozhin, who has a history of dramatic statements, says troops will leave fiercely contested city on 10 May. This live blog is closed

• What we know on day 436 of the invasion

The UK Ministry of Defence has said in its latest intelligence update that a recent uptick in Russian rail accidents in areas bordering Ukraine, attributed to sabotage committed by unknown actors, has almost certainly caused short-term localised disruption to Russian military rail movements".

It adds: Although its Railway Troop Brigades are capable of restoring lines quickly, these incidents will increase pressure on Russia's internal security forces, who will highly likely remain unable to fully protect Russia's vast and vulnerable rail networks from attack."