What does current U.S. support for Ukraine look like and what concerns exist about future security guarantees?

Over the past three years, the U.S. has provided about $50 billion in weapons and equipment to Ukraine, with another $20 billion already committed. However, uncertainty exists about whether all this aid will reach Ukraine in a timely manner as much is spaced out over months or years. A major concern among European allies is about security guarantees for Ukraine, especially after Trump administration officials questioned Ukraine's NATO aspirations. This has created a disconnect where the U.S. simultaneously tells Europe to take more responsibility for its own security while excluding European nations from bilateral discussions with Russia about Ukraine's future.