Kyiv, Ukraine CNN  —  Ukraine has been hit by a surge in Russian ballistic missile attacks, about a third of which used North Korean weapons that can only fly because they run on Western circuitry, obtained despite sanctions, according to Ukrainian military officials. Russia has fired about 60 North Korean KN-23 missiles at Ukraine this year, according to a Ukrainian defense official. That accounts for nearly one in three of the 194 ballistic missiles fired so far in 2024, a CNN tally of