The Insider: russo arrestato al raduno di Tbilisi deportato in Armenia [translated]

Autotranslated:

>A Russian citizen detained during protests in Tbilisi has been deported to Armenia, The Insider reports. A man named Mikhail, who lives and works in Georgia, was detained on the night of November 29-30. He claims that during the protest he stood next to the press, “tried to stay as far away from the protesters as possible,” and filmed the events on his smartphone for his project.

>Mikhail told the publication that the police tried to drive away the journalists, threatened them, and then threw him to the ground and “dragged him into a paddy wagon.”

>According to Mikhail, the police kicked each new detainee, and when they heard that he was speaking Russian, they began to behave even more cruelly toward him.

>On the night of December 1-2, Mikhail was transferred to the migration service, without any explanation. That same day, police officers came to his home and took his Russian passport. After that, he was put in a car and taken to the border with Armenia, Mikhail told the publication.

>He tried to return to Georgia, but the Georgian border guards did not let him through.

Strange story, why was he not deported to Russia as that is his homeland. Assume he did have a resident status in Georgia and life there with out a problem until now.
Why would Armenia accept an person that has been deported from Georgia and does not have a resident permit in Armenia nor the Armenian nationality.

Are Russian nationals free to settle within former Soviets state without any resident permits?