blossom(Талант его расцвёл пышным цветом лишь в последний период его жизни. It was only in the last period of his life that his talent blossomed. VLZ_58)
flourish(Litvinenko first served in counterterrorism in the mid-90s, then began infiltrating the criminal gangs that flourished in the chaos of the new Russia. VLZ_58)