Factbox-The big items in Washington's $40 billion Ukraine aid package

FILE PHOTO: The U.S. Capitol building is pictured at sunset on Capitol Hill in Washington, U.S., November 22, 2019. REUTERS/Loren Elliott

WASHINGTON (Reuters) - The U.S. Senate passed a bill on Thursday that would provide some $40 billion in additional military, economic and humanitarian aid to Ukraine following Russia's invasion as the Biden administration predicts a prolonged conflict.

The war has reduced cities to rubble, forced millions from their homes and, according to the U.N. human rights body, killed an estimated 3,500 civilians. Russia has little to show for it beyond a strip of territory in southern Ukraine and marginal gains in the eastern part of the country.