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Ukraine-Russia war: As Ukrainian troops advance into Russia, Michael Clarke explains what it means

Ukraine's incursion into Russia is "big" and represents much more than just a raid, our security and defence analyst Professor Michael Clarke says. The ISW think-tank has estimated that Ukrainian forces may have penetrated up to 35km (20 miles) inside Russian territory.

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The US has said it does not consider the action in Kursk to be escalatory.
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