Ottawa says it is imposing economic sanctions on 16 more Russian "entities" over that country's actions in Ukraine.

Prime Minister Stephen Harper issued a statement Sunday saying Russia's "illegal occupation of Ukraine and provocative military activity" remains a serious concern.

Harper says the latest measures should increase the economic pressure on Russia and "those responsible for the crisis in Ukraine."

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In the last couple of months, the Harper government has imposed a number of political and economic sanctions against senior officials and some institutions in Russia and Ukraine.

Ottawa has expelled a Russian diplomat, co-sponsored a UN resolution on the crisis and earmarked $220 million to help stabilize the Ukrainian economy.

Canada has also said it will send six CF-18 fighter-bombers to join a NATO air police mission.

"We remain committed to working with our allies to preserve and promote a free, democratic and peaceful world, and will take further actions if Ukraine's sovereignty and territorial integrity continues to be threatened," Harper said.