 He was quickly appointed French ambassador to the elector of Cologne, where he proved to have valuable diplomatic skills.Two years later in 1760 he was sent to St Petersburg as the French ambassador to Imperial Russia, where he arranged to be temporarily absent from his post at the time of the palace revolution by which Catherine II was placed on the throne.In 1769 he was sent to Stockholm (Sweden), and subsequently represented his government at Vienna in 1770 (Habsburg Monarchy), in 1773 Naples (Kingdom of Naples), and again at Vienna until 1783.