Trader consensus on Polymarket reflects low risk of NATO invoking Article 5—the alliance's collective defense clause—before 2027, pricing "No" at 86.5% implied probability, driven by the absence of any armed attack on member territory despite Russia's invasion of Ukraine. Recent incidents, such as Russian drone debris landing in Romania on October 3 and 10, prompted brief airspace alerts but were deemed insufficient for invocation by alliance leaders, reinforcing deterrence thresholds. NATO's July Washington Summit enhanced eastern flank deployments, air policing, and Baltic Sea patrols, while members like Poland and the Baltics report increased airspace violations and GPS jamming without escalation. Russia's resource strains in Ukraine, coupled with mutual deterrence, underpin trader confidence in no spillover, though snap tensions or hybrid threats could shift odds ahead of 2027.