China says it will counter President Trump's tariffs on Chinese products with tariffs of its own on multiple U.S. imports. It also announced an antitrust probe into Google and other trade measures.

After a 10 percent tariff on Chinese products took effect on Tuesday, China announced retaliatory measures, including tariffs and an investigation of Google.

The tariffs have also provoked political tension, including retaliation from China, which responded to Trump's move with tariffs on US goods and an anti-monopoly probe of Google, among other measures. The speed with which China filed its complaint with the WTO is an indication of Beijing's readiness for the trade fight.

US stocks open little moved by China's retaliatory tariffs. Mexico and Canada's tariff pauses suggests tariffs are negotiation tools, some say.

U.S. stock index futures were subdued on Tuesday as investors avoided risky assets after China struck back with retaliatory tariffs in response to new U.S. restrictions against Chinese goods. Minutes after U.

Shanghai residents expressed concern over worsening U.S.-China relations after an additional 10% tariff on Chinese goods imposed by President Trump came into effect. China responded minutes later with export restrictions on metals and tariffs on U.

China announced a wide range of measures on Tuesday targeting U.S. businesses including Google, farm equipment makers and the owner of fashion brand Calvin Klein, minutes after new U.S. tariffs on Chinese goods took effect.