Yes, every important organization (nation, religion, corporation) does PR. Its normal and healthy to have some public image management when competitors may try to destroy your image for their own gain.
This is a far cry from having a coordinated disinformation campaign to cause political instability in a foreign country. The evidence of Russia doing this to any effect with Trump or Brexit is extremely scant and circumstantial. Such a campaign would be massive, well beyond the capacity of a hidden conspiracy. It would involve entire media companies and NGOs. There would be far more smoking-gun evidence than the current standard of "guilt by association with someone who spent some time in Russia".
