The benchmark ASX200 index shed 5.4 points, ending the session at 8,374 points. In contrast, the All Ordinaries Index managed a minor gain, closing at 8,633.40 points. Despite a positive trend during most of the day, the market turned sour as trading closed in reaction to the deteriorating trade relations between the two economic giants.

In a tense development, China responded to U.S. tariff measures by enforcing its own, with some tariffs reaching as high as 15% on select American imports. This move came after U.S. President Donald Trump announced tariffs that include a 10% levy on Chinese goods. Notably, China targets American coal, LNG with a 15% tariff, while crude oil, farm equipment, and certain autos face a 10% tariff, effective from February 10.

Market analysis drew attention to the ASX's initial resilience. Analyst Tony Sycamore noted, "The ASX200 had managed to stay steady earlier after an agreement by US President Trump to delay tariffs on Mexico and Canada." The reprieve was attributed to both North American nations' commitments to stricter border security measures, leading to a temporary tariff freeze.

CommSec's Laura Besarati commented on the day's trading atmosphere, highlighting investors' anxiety over the potential onset of a trade war. “While today was better compared to a significant 1.8% plunge seen recently, investors remain on edge,” Besarati explained. “Breaking news just before close spurred a sell-off, with the market declining by the day’s end.”

The market sell-offs were widespread, with most sectors reeling under pressure. The energy sector, for instance, felt the brunt of lower oil prices, compounded by the US tariff delay on its major foreign oil suppliers. Leading the decline in stocks were Audinate Group and Lynas Rare Earths, falling 4.51% and 3.81% respectively.

Despite the overall downtrend, there were some bright spots. The healthcare sector, notably, witnessed impressive performances; Pro Medicus soared to a record high, climbing 5.18% following a substantial seven-year, $53 million contract win. Additionally, Nufarm rose 3.37%, and Appen made a significant leap of 9.77%.

In currency markets, the Australian dollar also faced pressures, dropping 0.67% to 61.84 US cents by the close of trade.

This coverage is based on reports originally published by NewsWire and others. The evolving dynamics of the global trade situation continue to have profound effects on financial markets around the world.