Stephen Harper and his fellow G7 leaders say they are suspending their participation in the Group of Eight until Russia "changes course.''
In a joint statement, the G7 nations say they will instead meet without Russia.
The move is aimed at isolating Moscow as punishment for its annexation of the Crimean peninsula from Ukraine.
The G7 nations have issued the statement following today's emergency meeting in the Netherlands.
The leaders say they are ready to "intensity actions'' against Russia if Moscow escalates the conflict further.
Ukraine today told its remaining troops in the Crimean peninsula to leave the Black Sea region, formally annexed by Russia last week, because it's too dangerous to remain.