Prime Minister Mark Carney has revealed that Canada is in high-level discussions with the United States about joining the projected $25bn "Golden Dome" missile defense system.

Unveiled by President Donald Trump, the system aims to counter advanced threats such as hypersonic and space-launched missiles using space-based sensors and interceptors, according to BBC.

Carney said the plan is under review, and his office confirmed talks are ongoing. The discussions come as part of broader Canada-US negotiations on trade and security.

Canada already cooperates with the US through NORAD, which monitors North American airspace and defends against cruise missile threats. The Golden Dome would go beyond this, targeting more sophisticated long-range and space-based attacks, BBC reported.