Amid all the speculation, I found this most interesting:
In an informal interview with journalist Ilya Zhegule on the eve of his death, and published on Forbes’ Russian language website, Mr Berezovsky reportedly said his life no longer made sense and spoke of his desire to return to Russia.
“There is nothing that I wish more today than to return to Russia,” he is quoted as saying.
“I had underestimated how dear Russia is to me and how little I can stand being an emigre.
In this respect, Berezovsky is far from alone. Many a Russian has left the motherland and found they missed it terribly, which often surprises them. I’ve heard stories of Russians fleeing the Soviet Union who return to face execution or imprisonment rather than stay out of the homeland. Something to do with the “Russian soul”, I believe.