China’s weekend move to impose tariffs on Canadian rapeseed products has sent prices for the crop plunging, adding more uncertainty to global food flows that are being buffeted by a series of trade wars.

Beijing retaliated with tariffs on many U.S. farm exports, and Justin Trudeau said Canada would slap tariffs on $100 billion of American goods over the next 21 days.

Beijing retaliated with tariffs of up to 15% on a wide array of U.S. farm exports. It also expanded the number of U.S. companies subject to export controls and other restrictions by about two dozen. In an address to Congress Tuesday night,

Beijing pledged to retaliate after Trump said the U.S. would slap another 10% tariff increase on Chinese goods starting next Tuesday, March 4. Trump also said Thursday 25% tariffs on goods from Canada and Mexico will go into effect on Tuesday after a one-month pause.

China will continue to grow bilateral relations with Canada on the basis of mutual respect and equality, the foreign ministry said after Mark Carney won the race to lead Canada's ruling party and become the next prime minister.

China has always advocated developing relations on the basis of 'mutual respect, equality and mutual benefit,' says Foreign Ministry spokeswoman - Anadolu Ajansı

China hopes that the incoming government in Canada will adopt a positive and pragmatic approach towards Beijing, Foreign Ministry spokeswoman Mao

Beijing, which set steep duties on canola, peas and pork, wants Canada and Mexico to resist U.S. pressure to raise tariffs on Chinese goods.

Initially, his administration imposed a blanket 25 percent tariff on trade with Canada, excluding certain energy products, and 25 percent on Mexico. However, some of these were later suspended for one month. Trump also placed an additional 10 percent tariff on trade with China.

Prime Minister Justin Trudeau of Canada warned that the Trump administration’s tariffs were leading to a trade war. Mexico’s leader vowed to impose countermeasures on Sunday.