Time flies, people change, organizations may or may not be able to adapt to new developments.The funny? thing is that I remember years ago in the SB Ukrainian Civil War thread ridiculing the Ukrainian Army making these exact same mistakes which led to several disasters as the seperatist artillery slaughtered them.
Ironically enough the seperatist militias are by far the best units of the Russian invasion while their supposedly proffesional counterparts donned their clown shoes.
In this case, the Ukrainian military and security services put in the effort to fix their issues, while the other side's capabilities have been either degraded due to sanctions, or have been slowly moved out to say support the mission in Syria, and someone forgot to get them back for the big show in time.
And of course a bit of a corruption issue, with not enough emphasis on fixing the unsexy backend like getting enough modern radios (like yeah you can't parade them on the red square like the Armatas.
Ukrainian Officer Details Russian Electronic Warfare Tactics Including Radio "Virus"
The officer said that sanctions that have targeted Russian made electronic warfare systems that use foreign-made components may be working.
www.thedrive.com
On the hacking front, I expect the usual thing happened. The people who were good with the stuff realized that they could earn more by going into ransomware, or go white hat and work for some big company, especially is the budget crunch after the 2014 sanctions meant that state employees' pay didn't follow inflation.