China's influence in Asia receded in the second year of the pandemic as the country turned more inward, while the U.S. expanded its power in the region through better diplomacy, according to an Australian research group.

China’s measure of power fell as the country wrestled with structural weaknesses in its demographics and financial system and become more isolationist, the Sydney-based Lowy Institute said in its Asia Power Index for 2021, which ranks 26 nations and territories. The index measures power using 131 indicators including economic clout, defense capability, cultural and diplomatic influence, and projected future resources.

Comparatively, the U.S. gained more influence in Asia this year due to President Joe Biden’s administration brokering better diplomatic relationships and a speedy recovery from the pandemic with the help of vaccinations, said Herve Lemahieu, the study’s research chief and director of Lowy’s Asian Power and Diplomacy Program.