As reported by Censor.NET, this was announced by international volunteer community InformNapalm in an article.
"The list of Russian military units involved in wars in Georgia, Ukraine, and now Syria, which has been growing like a snowball, seems to have been finalized: new investigations keep featuring previously mentioned Russian units. … The InformNapalm team uses friendly contacts in social media and returns to previously reported facts with the purpose of adding new evidence to them.
"This is exactly the case with the 'peacekeeper' from the 15th separate motorized rifle brigade of peacekeeping forces (military unit 90600, Roshchinsky village, Samara Oblast) of the Central Military District Alexey Kozlov, born in 1989, who obviously does not like his last name and hides under a cover name Chudaykin (archives of profile, album, contacts )," the authors of the investigation wrote.
Another profile of the soldier (archived here ) gives more details about him. Alexey has been a commander of a unit since 2011 and did serve in the military unit 90600.
Kozlov first 'flashed' in Ukrainian OSINT investigations back in fall 2014, when servicemen of the 15th separate motorized rifle brigade of the so-called peacekeeping forces of the Russian army from Samara were disguised as militants of self-proclaimed republics of Donetsk and Luhansk.
At around the same time a camp of 'peacekeepers' was found in Akatnovka village, not far from Ukrainian border in Rostov Oblast.
As seen from Google Earth images, the spot was empty back on Aug. 8, 2014 and filled with troops and hardware on Aug. 22, 2014. On Nov. 21, 2014 the camp was empty again, with spots from under tents that could also be seen on photos by Kozlov.
The military of the 15th brigade did not do home, investigators write. They started to enter Ukraine on a regular basis. Some of them continued serving in the illegal armed gangs of the unrecognized republics. One of such servicemen is Alexey Kozlov, as evidenced by his photo dated April 2015 made against an IFV with a flag of a motorized rifle battalion of the "DPR."
"Here is the same IFV with number 127 and the same "DPR" flag. It belongs to Oplot unit, evidenced by a V in a pentagon," investigators continue.
After returning to Russia, Kozlov continued his military career as a contract soldier. He wrote this is a commentary to one of his photos.
Related materials: Evidence of Russian aggression in Ukraine