US President Donald Trump has threatened to open new fronts in his tariffs war by announcing reciprocal levies on other countries as soon as Tuesday, branding this "the only fair way" to trade.

Trump's fresh salvo could bring a broad tariff hike to emerging market economies like India and take aim at European Union value-added taxes, fanning tensions with the bloc, analysts warn.

Tariffs are taxes imposed on goods imported from another country.

As for reciprocal tariffs -- during election campaigning, Trump promised: "An eye for an eye, a tariff for a tariff, same exact amount."

And on Sunday, he said he would make a detailed announcement on the tariffs on Tuesday or Wednesday, adding that "every country will be reciprocal."

One approach is to hike tariff rates on imports to match the rate that other countries apply to US products, said Goldman Sachs analysts in a note.

Matching this based on different products would raise the United States' average tariff rate by around two percentage points. Doing so to match the average........

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