Russia moves to revoke nuclear test ban treaty ratification amid tensions with West
- Russia's parliament voted to revoke ratification of the Comprehensive Nuclear Test Ban Treaty.
- Move comes amid deteriorating relations between Russia and Western nations over Ukraine war.
- Treaty bans all nuclear test explosions but has not fully entered into force.
- Russia cites US failure to ratify treaty as reason for withdrawal.
- Experts concerned Russia may resume nuclear testing, raising risk of new arms race.