evidence: This created the central failure of U.S. policy. Refusing to send sophisticated weapons to Ukraine failed to signal to Russian leaders that an invasion of Ukraine would hurt—and potentially even fail. [...] Even though Trump begrudgingly allowed the Javelins and more aid, his administration was unwilling to send a general officer to serve as the senior defense official in Ukraine. The Obama administration had appointed retired Gen. John Abizaid to be the senior defense advisor to Ukraine, but he was only a part-time consultant and no longer on active duty. Abizaid supported assigning an active-duty general to Ukraine to coordinate the U.S. effort and made this known to U.S. European Command and the Defense Department. The response was that the U.S. military did not have a general it could dedicate to the mission. [...] The poor signaling only continued with the Biden administration. Even as it became clearer that Russia was considering an attack, the United States drastically limited the supply of weapons that it provided to Ukraine. In November 2021, U.S. officials snubbed Ukrainian requests for shoulder-fired Stinger anti-aircraft missiles—a purely defensive weapon.