Putin's invasion grinds to a halt: Kyiv claims to have destroyed dozens of Russian helicopters overnight, retaken a city, and killed 11,000 troops while Russians have captured no significant territory sparking hopes Ukraine could win the war Ukraine claims to have destroyed dozens of Russian helicopters at an airfield near Kherson overnight Military also said it had recaptured Chuhuiv, near Kharkiv, and killed two commanders in the process Meanwhile units in Odessa claimed to have hit and destroyed a Russian patrol ship off the coast Experts say Russian losses becoming 'unsustainable' with no significant territory captured in recent days