The United States, Britain and Canada on Monday imposed sanctions against additional officials in Myanmar, in measures timed to mark one year since the military seized power and plunged the country into chaos.

Joint action by the three nations, which have all already imposed sanctions on Commander-in-Chief Min Aung Hlaing and other members of the junta, targeted judicial officials involved in prosecutions against deposed Nobel laureate Aung San Suu Kyi.

Washington also...