I don´t have IMDBPro, but how or why you think or you heard that Nolan have met with Reimo Sagor ( guy on this link)
Helen Schasmin (script writer and film critic) talked about it a few months ago that she represented Estonian scenarists as a consultant in a meeting with Nolan when he was in Estonia to meet with Sagar at the end of February.
I saw on local news video about Estonian actors on castinds .There have faces of Oja dynasty.
Rein Oja -
Nordic Stage Fight Society master degree from 2003.Anyway he was broken his arm in real fight in 1994 and it was even from movie Rummu Jüri when it was so realistic that he even does not feel that.Director of Draamateater http://www.draamateater.ee/en/rein-oja
Brother Tõnu Oja http://www.draamateater.ee/tonu-oja He was playing mostly losers, because he does not want to pain or harm someone.Traditionally his brother is bad guy and he good .
Tõnu´s son Pääru https://et.wikipedia.org/wiki/P%C3%A4%C3%A4ru_Oja
According to the IMDB cast list, Actor Yuri Kolokolnikov (Hitman’s Bodyguard, Game of Thrones) has joined the cast.
The representative of Y.Kolokolnikova confirmed the information about the shooting of the actor in the film C.Nolan "Principle"
Russian actor Yury Kolokolnikov will play a role in the new film directed by Christopher Nolan “The Principle”, which is scheduled to be released in July 2020. Representative of the actor Elena Shneiderova told the Moscow news agency.
“Yes, the information is correct, Yu.Kolokolnikov is already filming in the new film of K. Nolan“ The Principle ”. Filming is now taking place in Tallinn. The film will be released on July 17, 2020, ”explained E. Shneiderova.
The press agent said that she could not yet disclose whether the actor would play a positive or negative character. “The role, of course, is not the main one, but good., ”she added.
Y. Kolokolnikov graduated from the Schukinsky Theater School. He starred in the films of Peter Todorovsky, Vladimir Menshov, Kirill Serebrennikov, in 2014 he played the role of Stir in the fourth season of the television series “The Game of Thrones”.