The U.S. dollar has dropped to its lowest level in a week against major currencies, extending a three-day decline from a recent high.

This decline followed a brief increase in the dollar and other safe-haven currencies, which was short-lived after comments from Russia"s foreign minister suggested efforts to prevent nuclear conflict.

These comments came shortly after Russia announced a decrease in its nuclear strike threshold.

The dollar index, which tracks the currency against six major peers including the yen and euro, reached a low of 106.07, its lowest point since the previous Wednesday.

As of 0247 GMT, the index was recorded at 106.18, indicating ongoing volatility in the currency markets.