Opinion | I Was the Homeland Security Adviser to Trump. We’re Being Hacked. - The New York Times

...The logical conclusion is that we must act as if the Russian government has control of all the networks it has penetrated. But it is unclear what the Russians intend to do next. The access the Russians now enjoy could be used for far more than simply spying. The actual and perceived control of so many important networks could easily be used to undermine public and consumer trust in data, written communications and services. In the networks that the Russians control, they have the power to destroy or alter data, and impersonate legitimate people. Domestic and geopolitical tensions could escalate quite easily if they use their access for malign influence and misinformation — both hallmarks of Russian behavior...

https://www.nytimes.com/2020/12/16/opinion/fireeye-solarwinds-russia-hack.html