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https://i.guim.co.uk/img/media/23e6b87c3592de4207f58eafe32d29b809a2ca35/0_133_4000_2400/master/4000.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom,left&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctb3BpbmlvbnMucG5n&s=a030aac9d841e3348166c7fdbf779005Zelenskyy must now show that missiles will change this war, and his European allies must unify ahead of the Trump presidency, says Simon Tisdall, the Observer’s foreign affairs commentator