The United States says it is "appalling" for the Kremlin to suggest that two US citizens captured while fighting for Ukraine against the Russian invasion could face execution. "It's appalling that a public official in Russia would even suggest the death penalty for two American citizens that were in Ukraine," John Kirby, a White House spokesman, tells reporters after the Kremlin spokesman said the two men are not protected by the Geneva Conventions on prisoners of war. IMAGES AND SOUNDBITES