Russia-Ukraine war live: UK to send 20,000 service personnel to Nato military exercise; UN appeals for £3.3bn to support refugees

British defence minister will send army, navy and RAF personnel to one of largest Nato exercises since cold war; UN says 8.5 million people need aid

• See all our Ukraine coverage

Russia has handed a five-year sentence to a 20-year-old student for allegedly working with Ukrainian special services and planning sabotage attacks on military bases, local authorities have said.

The branch of the FSB security services in the central Russian city of Kurgan said the man had been detained on suspicion of working with a foreign state, according to AFP.