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TORONTO-- Canada's Conservative government says it is drafting tough new sanctions against North Korea in retaliation for sinking a South Korean warship earlier this year.

Foreign Affairs Minister Lawrence Cannon says Canada is also downgrading its already-limited diplomatic relations with the rogue nuclear state.

Cannon said Thursday the sanctions will prohibit imports and exports to North Korea, with certain humanitarian exceptions.

Earlier this year, Canada announced stiffer restrictions on trade, investment and other bilateral relations with the communist dictatorship and suspended high-level visits by its officials.

Those measures followed the sinking of the Cheonan, a South Korean navy ship, which killed 46 sailors.