Naina Yeltsin , wife of the Russian president , has undergone " a planned operation " on her left kidney and is in a satisfactory condition , Itar-Tass news agency said on Monday .
<response> <person>Naina Yeltsin</person> , wife of the <misc>Russian</misc> president , has undergone " a planned operation " on her left kidney and is in a satisfactory condition , <organization>Itar-Tass</organization> news agency said on Monday . </response>