OTTAWA—Canada and Britain have joined forces once again, this time to impose new sanctions on Myanmar after its military toppled its elected government in a coup. Canada has imposed sanctions on nine members of the Myanmar military under the Special Economic Measures Act, which allows the government to essentially freeze their assets. A trade embargo on arms and related material and related technical and financial assistance is also in force. Britain also said it was announcing sanctions against three government officials for their violations of human rights during the crackdown. Myanmar’s military seized power on Feb. 1, detaining the country’s political leader Aung San Suu Kyi and other democratic figures. Since then, the military has clamped down on protesters by using violence to break up demonstrations and blocking internet access. “Canada stands with the people of Myanmar in their quest for democracy and human rights,” Foreign Affairs Minister Marc Garneau …