Ukraine’s push into the Kursk region exposed Russia’s vulnerabilities. Here’s what to know. CBS News‘Completely undefended’: Nick Paton Walsh reports from Russian border point CNNUkraine’s Russia incursion gamble leaves enemy in shock, allies guessing FRANCE 24 EnglishUkraine on the Offensive Foreign Affairs MagazineUkraine’s swift push into the Kursk region shocked Russia and exposed its vulnerabilities The Associated Press