Boroda, the KGB stole the blueprints for it. There was a BBC documentary on the issue. While the British/French were developing the Concorde, the Russian's rushed it into production to beat the Concorde into the air - with disastrous consequences.
They also said the Russians changed the wing design so it was not identical to Concorde. The wing was very carefully designed by British/French and the changes the russians made was largely due to its failure.
If you do not see the direct copy of the Tu-144 to Concorde you are either blind or just ignoring the facts.