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Ukrainian military says it hacked Russia's federal tax agency
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
The most lucrative hack is one you keep to yourself.
In this instance, the publicity is an effort to do more damage.
Ukraine wants the Russian people to know that their tax records are wiped out. Hopefully many of them will skip paying or underpay. This will cut into the governments incoming revenue for many months or even years.