passport.yandex.ruは安全ですか？

From Wikipedia: Yandex (Russian: Яндекс) is a Russian Internet company which operates the largest search engine in Russia with about 60% market share in that country. It also develops a number of Internet-based services and products. Yandex ranked as the 4th largest search engine worldwide, based on information from Comscore.com, with more than 150 million searches per day as of April 2012, and more than 50.5 million visitors (all company's services) daily as of February 2013. The company's mission is to provide answers to any questions users have or think about (explicit or implicit). Yandex also has a very large presence in Ukraine and Kazakhstan, providing nearly a third of all search results in those markets and 43% of all search results in Belarus.