Moscow’s battlefield edge is waning, experts say. But President Donald Trump seems disinclined to ramp up pressure on the Kremlin to end the war in Ukraine.

Russia, using missiles and drones, launched one of the biggest assaults on the Ukrainian capital, Kyiv, since the beginning of the war more than three years ago and hours after a prisoner exchange began.

Russia is still refusing to sign up to an unconditional comprehensive ceasefire. It has no intention of returning any of the Ukrainian land it has seized, occupied and claims to have annexed. On the contrary: it's pushing for more.