A crewmember of the 122-mm self-propelled howitzer 2S1 Gvozdika prepares the howitzer for firing onto Russian positions near the occupied Ukrainian city of Bakhmut on December 18, 2023, in Donetsk Oblast, Ukraine.Roman Chop/Global Images Ukraine via Getty ImagesThe US has only one aid package left for Ukraine this month, a White House official says.John Kirby warned that after this package, key funding will dry up without Congressional approval.The Pentagon still has $4.4 billion to send US weapons, but the money to replenish those is limited.The US will announce one more military aid package to Ukraine before the end of the year, a top White House official said on Monday.