Ukraine war latest: Ukrainian forces stabilize situation in Kharkiv Oblast, 'partially' push Russian troops out of Vovchansk
Key developments on May 15: * Zelensky: Ukraine stabilizes situation in Kharkiv Oblast amid Russian offensive * General Staff: Russian forces 'partially pushed out' from Vovchansk * Ukraine deploys more forces to Kharkiv Oblast * Blinken: US to give Ukraine additional $2 billion in military financing * Source: Ukraine's military intelligence drones strike oil depot