Nikolay Kozachek was one of 12 Russian intelligence officers indicted by the special counsel in July of 2018.
Once the documents were obtained by Unit 26165, there were several attempts to get them into the hands of someone at the Trump Campaign. George Papadopoulos was told about the emails. Rob Goldstone called Donald Trump Jr to set up the infamous Trump Tower meeting. And there was Roger Stone’s meeting with the mysterious Russian spy, Henry Greenberg, and his friend Alexei. In any case, the hacked documents were posted online and given to WikiLeaks by members of Unit 26165 using the personas Guccifer 2.0 and DNCLeaks.
The constitution of Russia doesn’t allow the extradition, so it’s unlikely any of these officers will be brought to justice.