US President Donald Trump has signaled a dramatic escalation in trade tensions by threatening to impose a 100% tariff on Chinese imports starting next month. This announcement comes in the wake of China tightening its regulations on the export of rare earth materials, which are critical to various technology and automotive productions.

In a recent social media post, Trump stated that the United States would also enforce export controls on essential software, further complicating the ongoing trade disputes. His remarks were made in response to China's actions, which he described as increasingly hostile and as an attempt to hold the world 'captive.'

Trump's threats are significant, not only for the economic implications but also for political relations as he has hinted at the possibility of pulling out from a meeting with Chinese President Xi Jinping, although he later clarified that he would attend the scheduled summit.

In the immediate aftermath of Trump's announcement, financial markets reacted sharply, with the S&P 500 experiencing a substantial decline of 2.7%, marking its steepest drop since April this year.

China plays a dominant role in the production of rare earth materials, essential components in numerous products like smartphones and electric vehicles. The tightening of Chinese export rules, which comes after an earlier round of tariffs this year, has already had adverse effects on US companies, with Ford temporarily halting production due to supply chain disruptions.

In addition to new tariffs, experts note that China is reinforcing its influence by launching monopoly investigations into US tech companies, signifying a strategic maneuver ahead of imminent talks between the two nations. Trump's ongoing trade policies have set the stage for a complex negotiation environment as both countries navigate their economic interdependence amid geopolitical tensions.