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Polish Prime Minister Donald Tusk stated on September 10, 2026 that Polish and Ukrainian security services had prevented an unspecified direct threat against a Polish-Ukrainian border crossing overnight, according to the Institute for the Study of War assessment carried by Kyiv Post. Tusk did not publicly detail the nature of the threat or who was behind it. The announcement came amid a broader pattern of sabotage and hybrid incidents affecting NATO states bordering Ukraine. The same assessment reported that a Russian drone had entered Moldovan airspace on September 9 while Ukrainian President Volodymyr Zelensky's aircraft was preparing to depart Chisinau airport, an incident that heightened regional alarm. Border crossings between Poland and Ukraine are critical arteries for Western military aid, humanitarian supplies and refugee movement, making them sensitive potential targets. Warsaw has repeatedly accused Russian intelligence services of organizing sabotage and arson operations on Polish territory, allegations Moscow denies.