These U.S. companies are still doing business in Russia.

Starbucks and McDonald's are removing their logos from Russia because of the Ukraine crisis.

But, More than two dozen U.S. companies continue to conduct business in Russia, including Hard Rock Cafe and Sbarro.

27 U.S. corporations reject recommendations to withdraw or reduce operations in Russia, according to Yale management professor Jeffrey Sonnenfeld and his study team.

Sonnenfeld says it's not only food chains "digging in." Match.com and Tinder still operate in Russia.

Bumble decided differently. In March, the social networking site stopped operations in Russia and removed its applications from Apple App Store and Google Play Store in Russia and Belarus.

The fashion house "Tom Ford," which is based in New York, opened its first store in Russia in 2011. It is still there.

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