President Barack Obama called President Vladimir Putin of Russia on Tuesday to address the escalating violence in eastern Ukraine and Russia’s ongoing support for the separatists there. President Obama reiterated America’s support for the sovereignty and territorial integrity of Ukraine. Rocket strikes in the eastern Ukrainian city of Kramatorsk on Tuesday hit the headquarters of the military's operation against Russia-backed separatists and residential areas. The Ukrainian National Security and Defense Council says "preliminary data," shows  the rebel rocket attacks killed 15 people. This is VOA News.