The United States and China have imposed fresh tariffs on each other's goods.
The world's biggest economies show no signs of backing down from an increasingly bitter trade dispute that is expected to knock global economic growth.
Soon after the fresh duties went into effect, China accused the United States of engaging in "trade bullyism" and said it was intimidating other countries to submit to its will through measures such as tariffs, the official Xinhua news agency said.
However, Beijing also said it was willing to restart trade negotiations with the United States if the talks are "based on mutual respect and equality," Xinhua said, citing a white paper on the trade dispute published by China's State Council.
US tariffs on $200 billion worth of Chinese goods and retaliatory tariffs by Beijing on $60 billion worth of US products took effect at midday in Asia, though the initial level of the duties was not as high as earlier feared.
The two countries have already slapped tariffs on $50 billion worth of each other's goods earlier this year.
Chinese products hit with new US duties include vacuum cleaners to internet-connected devices, while US goods targeted by Beijing include liquefied natural gas and certain types of aircraft.
Though a senior White House official last week said the United States will continue to engage China for a "positive way forward," neither side has signalled willingness to compromise.
The US official said on Friday there was no date set for the next round of talks.
The Wall Street Journal reported that China, which has accused Washington of being insincere in trade negotiations, has decided not to send Vice Premier Liu He to Washington this week.
Economists warn that a protracted dispute will eventually stunt growth not just in the US and China but across the broader global economy.
The trade tensions have also cast a pall over broader relations between Beijing and Washington, with the two sides butting heads on a growing number of issues.
China summoned the US ambassador in Beijing and postponed joint military talks in protest against a US decision to sanction a Chinese military agency and its director for buying Russian fighter jets and a surface-to-air missile system.
Trade talks in Washington last month produced no meaningful progress.
The US administration will levy tariffs of 10% on the $200 billion of Chinese products, with the tariffs to go upto 25% by the end of 2018.
Beijing set its new levies on $60 billion of US goods at 5 and 10% and warned it would respond to any rise in US tariffs on Chinese products accordingly.
US President Donald Trump on Saturday reiterated a threat to impose further tariffs on Chinese goods should Beijing retaliate, in line with his previous comments signalling that Washington may move to impose tariffs on virtually all imported Chinese goods if the administration does not get its way.
China imports far less from the United States, making adollar-for-dollar match on any new US tariffs impossible.
Instead, it has warned of "qualitative" measures to retaliate.
Some analysts say there is a risk that China could allow its yuan currency to weaken again to cushion the blow to its exporters
