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Polish Prime Minister Donald Tusk has warned that Russia could stage attacks it frames as 'accidental' against Ukraine's NATO allies, arguing such incidents would be intended to test and undermine the credibility of NATO's Article 5 mutual defense guarantee. Tusk said the goal of such strikes would be to demonstrate that Article 5 protections exist 'only in theory.' The warning comes amid heightened tensions between Russia and NATO member states over the war in Ukraine, with Poland, a frontline NATO country bordering Ukraine, expressing particular concern about the risk of spillover conflict or deliberate provocations disguised as accidents.