Last year, the fund bought more than 1,000 shares in state-owned gas giant Gazprom and the Internet search engine Yandex, the BBC's Russian service reported Wednesday, citing Romney's tax returns. The fund subsequently sold the stock, incurring losses.
The Republican candidate has also invested in Youku, a Chinese version of YouTube, and the Chinese oil firm CNOOC.
Revelations about the investments come amid Romney's harsh rhetoric against Moscow and Beijing. In particular, he said in March that Russia is America's "No. 1 geopolitical foe."
Romney has argued that his investments are legitimate and managed by a blind trust - an institution that has full discretion over the assets, with the beneficiaries having no knowledge of the trust's holdings. In 2007, Romney noted that the trust's management was adjusting his investments to his political positions. Yandex shares only went on sale after an IPO in May 2011, while Gazprom stock has been available for years.
Romney's fund has also invested in German auto manufacturer Volkswagen, Japanese carmaker Toyota, Brazilian bank Itan and French clothing company Adidas.
According to the tax returns, Romney and his wife earned $14 million in 2011 and paid $1.9 million in taxes. His fortune is estimated at $200 million.