Putin visits Iran for talks on proposition to allow Ukraine grain exports, as UK suggests Russians facing 'acute' problems in maintaining invasion's advance

Olena Zelenska meets with Blinken, plans to reunite with Jill Biden and address Congress, though wife of war-torn country's president not traveling as representative of Kyiv

US first lady meets Ukrainian counterpart near border with Slovakia, tells her America stands with people of Ukraine; Olena Zelenska thanks her for 'courageous act'