U.S. fund managers have warned shareholders this month that they could face risks from current or future Western sanctions against Russia, Reuters reports. These warnings highlight the stakes for emerging-markets investors that are already arising out of the unrest in Ukraine.

According to Reuters, securities filings since April 4 have outlined potential problems for funds. Among the ones that could be worst affected are the $124.6 million ING Russia Fund, the $841.1 million SSgA Emerging Markets Fund and several iShares exchange-traded funds that are offered by BlackRock Inc.