"The arrest of a high-ranking Ukrainian intelligence agent accused of spying for Russia has highlighted the urgent need for a cleanout of the country’s key security service, a former deputy head of the agency has said"

It's kinda' hard to imagine why someone would sympathize with Russia in this conflict. Perhaps this person was bribed? Or blackmailed?

Or both. Plus family connections maybe

Hmm yes. That makes sense.

Ukraine has like most former soviet countries have had to deal with corruption. Ukraine's also facing the issue of finding someone who is not corrupt but also good at their job. That combo will be kind of hard seeing those before him were either pro-russia, corrupt or a combo of both. Either way I see this possibly hamstringing them saying others in the govt have also been fired for the same reason. Time will tell

its eastern europe so yes corruption

Well, it's actually easy. 45+ years old people were born and raised in the Soviet Union, served in the Red Army. So, some of them support Russia. It's quite easy to watch Russian channels in Ukraine, thus they are affected by Russian propaganda. They willingly sells information to Russia.

On the other hand, it is an opportunity to get money. The majority of 'traitors' has nothing.
A few examples:
Denis Pushilin - the head of Donetsk Republic. He ran multilevel marketing schemes and stole money from people. Now he controls mines in Donetsk and the whole Republic. His daughter is finally able to afford vacations on yachts in Dubai and Abu Dhabi.
Kirill Stremousov (killed) - anti-vaxxer, conspiracy theorist, blogger and traveler. Putin appointed him as a head of Kherson.
Every single one of them like that. Opportunists.

There are Americans that sympathize with Russia...

Interesting. Thank you for your response.

sad that his country is being destroyed and countrymen are dying around him and he's still engaged in selling it out

There are members of Congress that sympathize with Russia.

At least one ex president sympathizes with Putin.

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The article clearly states family connections. Did no one else read it?

Most likely money, or promised a position.

Why are you u so surprised ? We have this shit in EU, UK, US, spies in country that had past with russia and more problems with corruption, absolutely not surprise me.