more about Mr Putin's background and aspirations
"Putin too has espoused principles, then dropped them when they proved inconvenient. In Iraq in 2003, he made a stand in defence of international law, opposing any invasion without UN approval. In Georgia in 2008, he sent in the troops without even pretending to consult with the Security Council.
Last year, intervention in Syria was out of the question. This year, intervention in Ukraine is justified and unimpeachably legitimate. It may be that principles have never been the issue - and that Putin's objective has always been to maximise Russian power, and to defy Western attempts to rein Russia in...."
"He does not understand that the collapse of the Soviet system was predetermined, therefore he believes his mission is to restore the Soviet system as soon as possible," he says.
As a middle-ranking KGB officer who loved the Soviet Union, Putin lacked the perspective of senior officers, who knew full well the Soviet Union collapsed under the weight of its own inefficiency rather than because of Western plotting, Bukovsky says.
"It leads him exactly to… repeat the same mistakes. He wants this whole country to be controlled by one person from the Kremlin, which will lead to disaster," he says.
Putin's decision to invade Crimea was taken quickly and impulsively, by a small group of his favoured top officials. That means Putin has no one to warn him of the long-term consequences of his actions, and until he finds out for himself, he will maintain his course. That means relations with the West will remain uncomfortable, especially in areas he considers to be his "zone of legitimate interests".