In November, a train carrying almost 500 people came to a sudden halt in eastern Poland. A broken overhead line had smashed several windows, and the track ahead was damaged. Elsewhere on the line, explosives detonated under a passing freight train.

No one was hurt in either case and the damage was limited, but Poland, which blamed the attack on Russia’s intelligence services, responded forcefully: It deployed 10,000 troops to protect critical infrastructure.

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