Russia has started to prepare for war with Poland, the country’s military chief has said, in comments that echo warnings by European leaders about Moscow's intentions post-Ukraine.

General Staff of the Polish Armed Forces, Wiesław Kukuła , made the remarks to Polish media as his country’s authorities investigate explosions on the country’s railway lines discovered on Sunday.

Polish prime minister Donald Tusk had said there was an "unprecedented act of sabotage” and while Warsaw has not blamed Moscow directly, it has previously accused Russia of numerous hybrid acts of hostility.

Aurélien Colson, academic co-director of the ESSEC Institute for Geopolitics & Business, told Newsweek that the damage to the railway line sent a warning that hostile actors can hit Europe’s critical infr

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