Joint exercise this week included training for 'several real-world scenarios... with an emphasis on the Middle East,' Israeli military says

Kyiv says millions would have been left without electricity had attack been successful; officials say operation was weeks in the making and launched ahead of Moscow's invasion

Reactions could include federal indictments, sanctions, counterattacks and even exposure of Kremlin corruption, experts say

Experts say the reported American hack after downing of drone and Iran's denial highlight difficulty of verifying cyber operations