Security and Defence Cooperation

The United States is Canada's most important security and defence partner. Security and Defence relations between the two countries are longstanding, well-entrenched and highly successful.

This relationship reflects a unique friendship, underpinned by common values and close economic interdependence that has evolved over the course of the last century.

Canada and the U.S. are committed to strengthening the security of the border by working cooperatively to:

  • Address threats early;
  • Faciliate trade , economic growth and jobs;
  • Integrate cross-border law enforcement; and
  • Bolster critical infrastructure and cyber-security

For more on current areas of Canada-US Security Cooperation:

Defence Relations

The United States is Canada’s most important ally and defence partner. Our defence relations are longstanding and well entrenched. We have been partners in the defence of North America since the Second World War.

Defence cooperation with the United States maximizes the security of Canadians as our nations continue to work together to effectively counter new threats to the continent. We also cooperate closely in support of international peace and security, from the Caribbean to Ukraine and the Middle East.

NORAD: Two Nations, One Common Goal

For over 50 years, Canada and the United States have worked shoulder-to-shoulder in the bi-national North American Aerospace Defence Command (NORAD).  

NORAD is a bi-national military organization formally established in 1958 by Canada and the United States to monitor and defend North American airspace. NORAD plays a critical role in the defence and security of Canada and the United States.

NORAD monitors and tracks man-made objects in space and detects, validates and warns of attack against North America by aircraft, missiles or space vehicles, and also provides surveillance and control of Canadian and U.S. airspace. Canadians and Americans under NORAD command were the first military responders to the September 11th attacks.

NORAD is the longest-standing partnership in our collective histories, and the only agreement of its kind in the world. It remains a powerful symbol of trust and confidence between Canada and the United States in the common defence of our nations and our borders.


  • The U.S. is Canada’s most important security and defence partner. For over 50 years, Canada and the U.S. have worked side by side in NORAD.
  • The U.S. is Canada’s most important ally and defence partner.
  • Canada and the U.S. share a land border close to 9,000 kilometres (over 5,500 miles) in length.