KHIMKI, Russia — U.S. basketball star Brittney Griner was convicted Thursday in Russia of drug possession and smuggling and was sentenced to nine years behind bars in a politically charged case that could lead to a high-stakes prisoner exchange between Washington and Moscow.The 31-year-old Griner, a two-time U.S. Olympic champion and an eight-time all-star with the WNBA’s Phoenix Mercury, listened with a blank expression as an interpreter translated the verdict by Judge Anna Sotnikova, but her lawyers said …