U.S. Secretary of State John Kerry on Tuesday laid a wreath at Canada's National War Memorial in Ottawa, where a Canadian soldier was shot and killed by a lone attacker last week.
Kerry called the death of Corporal Nathan Cirillo a premeditated terrorist attack.
After killing Cirillo, the gunman opened fire inside the Canadian Parliament building before being shot to death by the sergeant-at-arms.
Thousands mourned Cirillo at a funeral Tuesday in his hometown of Hamilton, Ontario. An emotional Prime Minister Stephen Harper eulogized the soldier as someone the entire country looked to with pride, gratitude and deep, abiding respect.
Two days before the Ottawa attack, a suspected Islamic extremist deliberately ran down two Canadian soldiers in Quebec, killing one.
Kerry said the world has been a witness to Canada's strength and courage. He said the United States and Canada would be partners to defeat terrorists and expose what he called their hypocrisy.
Kerry also held talks Tuesday with Harper and Foreign Minister John Baird.