With the war now in its fourth year after Russia’s February 2022 invasion of its neighbor, the effort is draining resources on both sides, although Russia has more resources and people to sustain its fight.

Ukrainian President Volodymyr Zelensky has said that his country needs funds of more than $65 billion annually as it continues to battle against Russian forces. "Ukraine must tackle a deficit of $40 billion.

Ukraine and Russia attacked targets on each other's territory on Thursday after brief direct talks between the two sides failed to make any progress on steps to end nearly three-and-a-half years of war.

The warring sides remain far apart after the third round of U.S.-brokered peace negotiations on Wednesday. But there was progress on humanitarian issues.

Russia and Ukraine discussed further prisoner swaps on Wednesday at a brief session of peace talks in Istanbul, but the sides remained far apart on ceasefire terms and a possible meeting of their leaders.