The US Dollar Index extended its decline for the fourth consecutive day, slipping to around 98.70 during European trading hours on Thursday, according to FX Street. This index measures the US Dollar's performance against a basket of six major currencies.

The sustained weakness suggests growing pressure on the US Dollar as investors weigh global economic factors and central bank policies. The index had previously hovered near the 99.00 level before this recent drop.

For Japanese markets, a softer US Dollar could influence export competitiveness and cross-border investment flows, especially as the yen remains sensitive to dollar movements.