Long-threatened tariffs from U.S. President Donald Trump have plunged the country into a trade war abroad — all while on-again, off-again new levies continue to escalate uncertainty.

The EU is set to impose tariffs on a range of US goods worth some $28 billion in response to President Donald Trump's decision to increase tariffs on all steel and aluminum imports to 25%

Canada could impose non-tariff measures such as restricting its oil exports to the United States or levying export duties on products if a trade dispute with the United States escalates further, Canada's energy minister Jonathan Wilkinson said on Tuesday.