What is Article 5?

Under Article 5, Nato’s charter stipulates that “the Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all.”

Nato says: “It remains a unique and enduring principle that binds its members together, committing them to protect each other and setting a spirit of solidarity within the Alliance.”

Article 5 has only been invoked once before; after the 9/11 attacks on the US. It included launching Nato’s first ever anti-terror operation.

What this means, in essence, is that if Russia launches as attack against any Nato member, all 30 will be at war with President Putin’s country, including the UK and the US.

Resolved if any country attempts to invoke Article 5 even if they are not successful.