Russia-Ukraine war live: ‘fragile morale’ among Russian forces, says UK – as it happened

British ministry of defence says Russian soldiers also troubled by lack of equipment and uncertainty over war's objectives

• What we know on day 298 of the invasion

The time is approaching for a negotiated peace in Ukraine to reduce the risk of another devastating world war, but dreams of breaking up Russia could unleash nuclear chaos, the veteran US diplomat Henry Kissinger said.

Kissinger, an architect of the cold war policy of detente towards the Soviet Union as secretary of state under Republican presidents Richard Nixon and Gerald Ford, has met Vladimir Putin multiple times since he first became president in 2000.