Moscow's troops are retreating from the area around Ukraine's second-biggest city.
Russian forces that previously were bombarding Kharkiv are shifting their focus to protecting supply lines, the Associated Press reported, citing Ukrainian military officials.
U.S. Senate Republican Leader Mitch McConnell, along with other senior GOP leaders, met with Ukraine President President Volodymyr Zelenskyy in Kyiv.
Meanwhile, Russia's deputy foreign minister has said his country will take action if NATO moves nuclear forces near its border, according to Russian news agencies cited by Reuters.
In the most precise prediction by a senior Ukrainian official to date, Major General Kyrylo Budanov said he believes the war will be over by the end of the year.