Polish PM Tusk warns Europe has entered ‘pre-war era’ EURACTIVPolish leader warns of ‘prewar era,’ urges European nations to invest in defense Fox NewsEurope in ‘pre-war era,’ warns Poland’s Prime Minister Tusk, citing Russia’s threat CNNEurope must get ready for looming war, Donald Tusk warns The GuardianPolish leader Donald Tusk warns of ‘prewar era,’ urges European nations to invest in defense New York Post