President Joe Biden on Saturday signed legislation to support Ukraine with another $40 billion in U.S. assistance as the Russian invasion approaches its fourth month.

The legislation, which was passed by Congress with bipartisan support, deepens the U.S. commitment to Ukraine at a time of uncertainty about the war’s future. Ukraine has successfully defended Kyiv, and Russia has refocused its offensive on the country’s east, but American officials warn of the potential for a prolonged conflict.

The funding is intended to support Ukraine through September, and it dwarfs an earlier emergency measure that provided $13.6 billion.

The new legislation will provide $20 billion in military assistance, ensuring a steady stream of advanced weapons that have been used to blunt Russia’s advances. There’s also $8 billion in general economic support, $5 billion to address global food shortages that could result from the collapse of Ukrainian agriculture and more than $1 billion to help refugees.