(Reuters) - The United States is the world's biggest steel importing nation, buying 35.6 million tonnes of the building raw material in 2017.

U.S. President Donald Trump is planning to impose a 25 percent tariff on steel imports and 10 percent on aluminum in a bid to protect American jobs. But other countries have threatened with retaliatory actions, fuelling fears of a global trade war.

Following are the top steel exporters to the United States with their corresponding percentage of total U.S. steel imports:

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1. Canada 16.7 percent

2. Brazil 13.2 percent

3. South Korea 9.7 percent

4. Mexico 9.4 percent

5. Russia 8.1 percent

6. Turkey 5.6 percent

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7. Japan 4.9 percent

8. Germany 3.7 percent

9. Taiwan 3.2 percent

10. China 2.9 percent

11. India 2.4 percent

Source: Wood Mackenzie

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(Reporting by Manolo Serapio Jr.; Editing by Lincoln Feast)