What happens if NATO goes to war with Russia?

A NATO-Russia war would be extremely dangerous and could quickly become a major conventional war with cyberattacks, sabotage, economic shock, and a real nuclear risk.

If Russia attacked a NATO member, NATO could invoke Article 5: an attack on one is treated as an attack on all. That would trigger a collective response, but not every ally would act the same way. Likely actions include air and ground deployments, naval support, intelligence sharing, air defense, and sanctions.

Most likely early fighting would be on NATO’s eastern flank, especially the Baltic region and Poland, where reinforcement would matter most. Both sides would try to control the air and sea, while cyberwarfare and disinformation could hit power, communications, transport, finance, and military logistics.

Biggest risk: escalation. If either side feared defeat or a threat to core interests, nuclear use becomes a serious danger. Even a limited nuclear strike could spiral into wider retaliation.

It would also likely disrupt global energy, trade, shipping, and supply chains far beyond Europe. The exact outcome would depend on the trigger, force levels, and whether escalation could be contained.