There is no doubt that Russia attempts to manipulate elections in other countries, every country that has a power does the same, even Kazakhstan interferes with the elections of Kyrgyzstan. However, it doesn't mean that these attempts were successful. No evidence. Maybe it was Vietnamese hackers. Why no one thinks about Vietnamese hackers? http://www.securityweek.com/apt32-vietnamese-hackers-target-foreign-corporations

Maybe it was Chinese? Why not.