"SolarWind" saga :
What is SolarWind? : A network monitoring tool sold by a US company.
Problem? : it had security issues. Which were compromised by non-US hackers [read Russian] and thus they infiltrated into thousands of large agencies.
Worst case? Leaking of Microsoft's source codes.
.
https://www.engadget.com/russia-solarwinds-hack-broader-than-expected-211046098.html