Russia will unleash "the next wave of hell" on besieged Ukrainian city Mariupol after it refused to surrender - but lacks the firepower to escalate its assault, experts believe.
The city has been "comprehensively trashed" by missiles fired by Vladimir Putin's forces, but defiant leaders today said there was "no question" they would lay down their arms.
Civilian buildings including a theatre where families were hiding have been targeted in recent days, while President Volodymyr Zelenskiy, said the siege was "a terror that will be remembered for centuries to come".
