PRAGUE, Nov 6 (Reuters) - Russia claimed its fifth Billie Jean King Cup title on Saturday as world number 40 Liudmila Samsonova erased a one-set deficit to overcome Swiss ace Belinda Bencic in a hard-fought second match of the finals. The 22-year-old Russian"s 3-6 6-3 6-4 victory gave her team an unassailable 2-0 lead against Switzerland.