I have seen more and more people getting worried about their US ranking affected just because they get links from sites hosted in foreign countries. I recommend there is nothing to worry because of this.
Google ofcourse geo-targeting buy they also have ways to relate links to sites regardless of where they come from. If your site is hosted in US and have enough US backlinks i wouldn't worry about links from other sites.
Its very normal to get backlinks from other language sites especially if you run an information site. We get ton of backlinks from Japanese, swedish, german, spanish and lots and lots of other language sites still our rankings never moved. So i wouldn't worry about it. Just keep improving your site and always lookout for natural backlinks it will be a hit.