China and Russia are known to put pressure or watch/listen on nationals who work in key positions in foreign companies.
As US allys Australia, Israel don't pose the same threat. A lot of information that could be gained would be available through the US government and shared with the those parties if there was a need.
https://en.m.wikipedia.org/wiki/Jonathan_Pollard
https://www.google.com/amp/s/amp.theguardian.com/world/2019/...
There are definitely Chinese and Russian spies but there are spies from many countries besides those. The question is why are you singling out those countries and why now.
The reason is that there is a Cold War brewing between the US and China and this company has become an agent of that war.
The seems to be a propaganda war against China brewing in the US. I last saw this level of jingoism when Bush Jr decided to take over Iraq on the pretense of Saddam Hussein supposedly having nuclear weapons. All the TV network anchors were pushing for war and pushing the supposed threat. Later we find out it was all lies.
Why those two countries specifically? In Russia you can get imprisoned for a variety of political/strategic reasons if you refuse to cooperate. China implemented there own internet for spying.
When you visit these countries you are advised to buy new devices and throw them out on return to avoid backdoors.
General Powell misleading the UN and TV networks was based on having chemical weapons. Nuclear weapons is the fear with Iran. It was believed because the UN weapon inspector Hans Blix was being railroaded with fake traffic jams and other tactics preventing him from investigating. After he pulled out and Sadam had a history of using these types of weapons on his own people, it made the claim easier to accept without more proof.
The same is true of Australia, the USA, and the UK - these nations have no issues with imprisoning each others citizens if it behooves them - i.e. if the individual chooses not to cooperate with the military-industrial-pharmaceutical complex.
China or Russia would not pose any threat if they managed to completely infiltrate US institutions, because they would be, at this stage, the US greatest allies. Sure, China might try to constantly drag the US into pointless wars in Asia, but again it would be fine because it would be to defend the interests of China, the greatest ally.