US stock index futures declined due to concerns over a potential ban on exports of AI-related products to China 

The technology sector was the most affected, with companies like Nvidia and AMD experiencing a decline in stock prices 

The dip in stock futures followed a recent rally driven by positive economic data 

Traders were cautious and awaited updates from the central banking forum in Sintra, Portugal 

The central bank figures' discussions on inflation and borrowing costs were of particular interest to investors 

The market sentiment could be influenced by comments from key central bank leaders, such as Jay Powell 

Despite the dip, some experts remained optimistic about the market's future performance 

The recent rally was seen as a positive sign, with potential for further market upturn 

Investors continued to navigate economic and geopolitical factors that may impact stock prices