In its 5th summer of war, Ukraine is facing a paradox: As it becomes more capable of striking deep into Russia, it's becoming less capable of protecting its own cities. The reason is simple, and admitted plainly by Zelenskyy: Ukraine has run out of American Patriot interceptors, which are the only system capable of stopping Russian ballistic missiles. Russia fired 27 ballistic missiles at Ukraine on Saturday, primarily at Kyiv. Kyiv has rarely been this vulnerable, but some there believe the Kremlin may be vulnerable too. MORE FROM UKRAINE | Zelenskyy says a North Korean missile fired by Russia killed a family in central Ukraine