'Western' meaning the usual aggressors, the “Five Eyes” intelligence-sharing alliance of the United States, Britain, Australia, New Zealand and Canada.
Not particularly. The last known time a western aggressor hacked into such a Russian intelligence company, Kaspersky, it was revealed to be the Dutch intelligence agency, sharing their info with the US. So it could be any of the 5 eyes or any of their partners.
Here it's vague enough to be meaningless to the point of irresponsible journalism. WHICH COUNTRY?
The article mentions, that sources could not confirm which nation launched the attack.