US concerns over Moscow's support for separatists in Ukraine
The move came during telephonic discussion between US President and his Russian counterpart.
The United States has expressed deep concern over Moscow's increased support for separatists in Ukraine.
The move came during a telephonic discussion between US President Barack Obama and his Russian counterpart, Vladimir Putin.
Speaking to reporters after the talks at the White House, President Obama said he discussed his preference for a diplomatic solution of the Ukrainian crisis with the Russian leader.