International Monetary Fund chief Kristalina Georgieva on Wednesday called for cooperation in the Group of 20 major economies amid tensions among members over Russia’s war in Ukraine, although acknowledging it is a “difficult moment.” “It is so obvious that cooperation must and will continue,” she told a press conference, which took place just ahead of the meeting of the G-20 finance chiefs in Washington. The gathering is gaining attention as the first G-20 ministerial talks to be held since Russia began its invasion on Feb. 24. Russia is a member of the group, which also includes the United S…