Abrams and Leopard tanks that the US and Europe have promised to deliver, it may have the opportunity to buy a cutting-edge German tank. Acquiring the next-generation Panther KF51 would give Ukraine the chance to leapfrog the older tanks that Western donors are sending — as well as the mostly Cold War-era tanks that Ukraine already uses — but taking on an unproven vehicle could further tax Ukraine's military as it struggles to incorporate older Western tank models into its armed forces. With all the challenges that Ukraine already faces, that's a gamble