China's state media have praised some U.S. firms for "strong collaboration" - commentary that comes amid fears of a trade war and is reminiscent of how tensions with the U.S. were covered by Chinese newspapers during Donald Trump's first presidency.

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.

BEIJING, Nov 27 (Reuters) - China's state media warned U.S. President-elect Donald Trump his pledge to slap additional tariffs on Chinese goods over fentanyl flows could drag the world's top two economies into a mutually destructive tariff war.

The tariffs, if implemented, could dramatically raise prices for American consumers on everything from gas to automobiles to agricultural products.

Mexico has supplanted China as the main source of goods, but imports keep climbing.

A series of swipes at American companies show how China could take the initiative in a new trade war, using its economic dominance to exact pain.

Chinese state media has cautioned that President-elect Donald Trump’s pledge to impose additional tariffs on Chinese goods risks igniting a devastating tariff war between the world’s two largest economies.

Donald Trump has already begun to ramp up threats of a trade war, with a vow to enact sharp new tariffs across the board on imports from Mexico, Canada, and China to strong-arm them into stopping the flow of drugs and migrants.