The treaty is aimed at building confidence and familiarity among State Parties through their participation in the overflights.

"We have a moral obligation to ensure that the trillions of dollars for COVID-19 recovery - money that we are borrowing from future generations - does not leave them burdened by a mountain of debt on a broken planet."

The last nine impoverished counties, all in southwest China's Guizhou Province, have eliminated absolute poverty, the provincial government announced Monday.