Foreign interests are always interfering in US elections (and everyone else's too); that's the price of being a democracy. It's a tale as old as democracy itself. There are plenty of other notable examples in US history, but it's a constant, and efforts obviously only intensified in the post-war era as America became more important to everyone else.

The example in 2016 of one particular country's actions is more about what the establishment chose to report for political reasons, although obviously there is some novelty in the way influence efforts are changing over time to adapt to new technologies.