Copper futures tumbled to below $4.25 per pound on Tuesday, hitting a one-week low after US President Donald Trump threatened other major economies, including China, with tariffs as part of a wider negotiation strategy, raising the risk of a global trade war. That would hurt demand for metals like copper which is hinged on an economic rebound in China. Caution also dominated sentiment ahead of the Lunar New Year holiday in China, as well as key interest rate decisions from the Bank of Japan and the US Federal Reserve in the coming days. Meanwhile, there remains hope that China will follow through on its promises of additional stimulus, with state media reporting that the People’s Bank of China may reduce the reserve requirement ratio for banks later this month. On the supply side, Chile revised its copper production forecast, now expecting 5.54 million tons by 2034, down from a previous estimate of 6.34 million tons.