1. NASA wants Russia to maintain a presence on the ISS. Many of the necessary functions for operating the ISS are spread across both the US (international) and Russian sides. If the Russians left, that would dramatically complicate operations.
2. How would the US even get to the spacecraft in question? It's not like someone could casually take a stroll around the station and pop in a hole with a drift and hammer.
3. Even if the US could access the spacecraft in question, it's not obvious to me that US Astronauts would actually do the deed instead of blowing a whistle. It's not like they're CIA operatives. There's a great deal of camaraderie between the personnel of each side.