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

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.

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