Russia online search leader Yandex gave a mixed Q4 earnings report early Tuesday and said sales growth will slow this year, sending shares down 10.1%. Earlier in the day, the stock was down as much as 13.6%. Per-share profit was 29 cents, in line with estimates, according to Thomson Reuters. But net income of $89.4 million slightly missed the $92.8 million analysts expected, according to Thomson Reuters. Yandex (YNDX) says it's investing in new