The Russian Tennis Federation was quick to claim Elena Rybakina as “our product” on her run to the women’s title at Wimbledon. They then praised her training program in the country after she won the Venus Rosewater Dish as Wimbledon champion while representing Kazakhstan. “It’s the Russian school, after all. She played here with us for a long time, and then in Kazakhstan,” Russian Tennis Federation president Shamil Tarpishchev told sports website Championat on Saturday after Rybakina beat Ons Jabeur 3-6, 6-2, 6-2 on Centre Court. The 23-year-old Rybakina was born on Moscow and played in the Ru…