Accusing people of working for Russia has a very ugly history in US politics.

[LAS14]

18. Hillary should have avoided the word "asset,"

even though it was probably the most accurate word available. It's too sophisticated for most of her audience to understand that an "asset" doesn't have to be a spy or a traitor. We shouldn't be wasting time attacking Gabbard's intentions, just her policies and the threat of a 3rd party candidate. An asset is just very useful for whatever reasons. The link below is very helpful.

Following its established playbook, Russia has increasingly interfered in the politics of traditional opponents throughout the West in the hopes of undermining democracy and stability from within. Donald Trump was a political novice with a longstanding public admiration for Russian President Vladimir Putin and a penchant for advancing conspiracy theories. He espoused isolationist policies and had potentially compromising financial relationships with Kremlin-aligned oligarchs. He also had few apparent scruples and was running against a woman Putin considers among his main adversaries. Trump was simply an ideal candidate for the Kremlin to back. There is also reason to suspect that Russia began cultivating Trump as an asset long before his campaign for president, a common tactic the Kremlin pursues with people it suspects may be useful in the future.


https://themoscowproject.org/collusion-chapter/chapter-3/

Edit: And here is another place to see the definition of "asset."

Russia's success in attacking our democracy is not tied to their ability to recruit Gabbard (or anyone else) to parrot Russian talking points. Rather, their success comes with their ability to influence and manipulate, through amplification, certain messages and candidates that create division. As we saw in 2016, Russia was able to aid Donald Trump by using tailored and manipulated social media campaigns, without even the knowledge or direction of the Trump campaign itself. After all, Russia's goal in 2016 was the delegitimization of our elections; they did not need to coordinate with Trump to make that happen. That's the disturbing parallel with Gabbard: Russia can seek to support her, without her knowledge.


https://www.newsweek.com/tulsi-gabbard-being-used-russians-former-us-double-agent-evidence-clear-opinion-1466750