By Emese Bartha and Paulo Trevisani

Global government bond yields fell Monday, helped by declining oil prices and as investors anticipate that further measures from the U.S. Treasury are possible to tame high yields.

The U.S. Treasury last week doubled the volume of long-end debt buybacks after yields rose to multiyear highs. Yields declined overnight but the fall intensified after CNBC reported, citing anonymous sources, that the Treasury could use its General Account to fund the increased buybacks announced last week.

Meanwhile, Treasury Secretary Scott Bessent is expected to give details on U.S. plans to increase economic pressure on Iran in a press conference on Monday.

"We would not dismiss the potential impact of further Treasury actions, particularly since policymakers have now signaled a greater willingness to intervene if market conditions deteriorate," UBS Global Wealth Management said in a note.