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KIEV, UKRAINE - FEBRUARY 22: Security forces inspect a rocket launcher truck and a heavy tank that are part of an exhibition the Ukrainian government claims proves Russian direct involvement in the fighting between Ukrainian troops and pro-Russian separatists in eastern Ukraine prior to a visit to the exhibition by Ukrainian President Petro Poroshenko on February 22, 2015 in Kiev, Ukraine. Russia has denied sending heavy weaponry to the separatists, admitting only that Russian volunteers are participating in the fighting. (Photo by Sean Gallup/Getty Images)

KIEV, UKRAINE - FEBRUARY 22:  Security forces inspect a rocket launcher truck and a heavy tank that are part of an exhibition the Ukrainian government claims proves Russian direct involvement in the fighting between Ukrainian troops and pro-Russian separatists in eastern Ukraine prior to a visit to the exhibition by Ukrainian President Petro Poroshenko on February 22, 2015 in Kiev, Ukraine. Russia has denied sending heavy weaponry to the separatists, admitting only that Russian volunteers are participating in the fighting.  (Photo by Sean Gallup/Getty Images)