The Danish defence intelligence service published a report on Thursday flagging a "low but growing risk" that Russia could attack Nato territory in the near term.
According to the assessment, a scenario could involve long-range strikes on Nato infrastructure that supports Ukraine, or a limited incursion into a neighbouring country with a small number of troops, potentially operating without insignia.
The warning landed within hours of Poland attributing a fire at a Starlink satellite station to an "act of sabotage", an incident that has further raised tensions along Nato's eastern flank amid the ongoing war in Ukraine.
The report is among the most direct official warnings from a western intelligence service that an attack on alliance territory may be possible within months, rather than a distant contingency. Danish intelligence has not detailed specific targets or a timeline beyond the broad window, and the assessment characterises the threat as low but increasing.