Translate the following English sentence to French:
"I am using the phrase 'is said to be' on purpose, because official Chechen sources are still denying that they would have exchanged Mr Babitsky for a number of Russian prisoners of war."
J'utilise intentionnellement le conditionnel car, à ce jour, les officiels tchétchènes nient avoir échangé un certain nombre de prisonniers de guerre russes contre Babitski.