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As Russia provokes Europe with drones, jets, strikes on tankers and is the prime suspect in the bombing of a Polish train, it is becoming increasingly likely that Nato may have to act, warns world affairs editor Sam Kiley
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Russia stands accused of sabotage on Poland's railways. The Kremlin attacked a gas-loaded tanker on the Romania border, forcing the evacuation of several villages in the country. Moscow has repeatedly flown drones into European airspace and jets over Estonia.






