U.S. national security adviser Jake Sullivan warns that Russia is shifting its focus in its war against Ukraine to the country's east and south, after experiencing a stronger-than-expected defense by Ukrainians supported by Western allies. (April 4) Subscribe for more Breaking News: http://smarturl.it/AssociatedPress Website: https://apnews.com Twitter: https://twitter.com/AP Facebook: https://facebook.com/APNews Instagram: https://www.instagram.com/APNews/ ​ You can license this story through AP Archive: http://www.aparchive.com/metadata/youtube/5502acd0046144c6940e3a072b25b05a