All the public knew is that allegedly Israel hacked Kaspersky and noticed the Russian government using Kaspersky's tools to try and dig out secret documents.
I mean who knows, maybe the Russian government had a backdoor that they were abusing, maybe they hacked Kaspersky themselves, or maybe they were just given access.
I would have given Kaspersky plausible deniability before this article.. now I just don't believe them.
At face value their explanation sounds reasonable.
However, the original claim is that the Israelis were watching in real-time as agents searched computers around the world for secret codenames [0]... which is a world away from the explanation given in the submitted article.
[0] https://www.nytimes.com/2017/10/10/technology/kaspersky-lab-...