Russia accuses US of 'smear campaign'
Russia has accused the US of launching a "smear campaign" over its alleged involvement in the conflict in Ukraine, BBC reported.
The foreign ministry in Moscow said on Friday it rejects "unfounded public insinuations" from the US government.
But the Pentagon says it believes the movement of Russian heavy-calibre artillery systems across the border into Ukraine is "imminent."
Separatist rebels in eastern Ukraine have been accused of shooting down the Malaysia Airlines plane.
The US says it believes rebels shot down the passenger jet with a Russian-provided SA-11 Buk surface-to-air missile, probably by mistake.
Russia has frequently denied sending heavy weapons into Ukraine but rebel leaders have given conflicting accounts of whether they had control of a Buk launcher at the time the plane was downed.