If a Russian secret agent won a US presidential election, what sort of things would you expect them to do or say once sworn in?

I'd expect them to introduce friction and confusion amongst allies, major trading partners, and at home, degrade and dismantle major institutions like in the FBI, CIA, and NIH so they cannot get a see what is going on, take a foreign policy stance regarding Ukraine that is in Russia's favor, further exacerbate domestic issues to distract and pin the people against each other, and pin more blame to groups other than Russia like Mexico and China.

That way, Russia can move and act more freely without the US knowing or even being able to do anything and the US will have lost their capacity to function for years-decades at best.

We're ripe for a massive increase in corruption because key groups with oversight capabilities are being done away with. FBI are being degraded, so we won't even know let alone measure what is going on. NIH is being degraded, so we are losing our key health surveillance and research infrastructure to address chronic illnesses and new infectious disease we know are coming our way. Musk even took aim at major US defense programs like the F35, which we know is accumulating strong evidence of its effectiveness as Allied countries have shown, so the military may well be degraded too on top of things.

Russian agent or simply corrupt and unhinged (why not both?), the Trump administration is in the process of doing, and has done, more damage to us than our adversaries could do alone.

The question of "Is he a Russian asset or not?" doesn't matter if the outcome is the same. Putin is probably building more troll farms as we speak.

They would probably start dismantling the government agencies that are investigating them.

And maybe slip up and give a Nazi salute during the inauguration

Gestures around generally

Yup. It's happening now, just look around.

Although I'd argue that Trump is too stupid to be a "secret agent." He's just a fricking useful idiot for them.

I assume Musk bought the pee tapes from Putin and that's why Musk is now holding press conferences in the Oval Office.

They still think the pee tapes are a thing.

Why can't libs recognize Russia as the irrelevant backwater that it is?