The United States has imposed further Russia and Ukraine-related sanctions, including on Crimean port operators, former Ukrainian officials, and a former Russian gas trader.
The Treasury Department said on July 30 that it had placed the names of 26 individuals and entities on blacklists that freeze any assets they may have in U.S. jurisdictions.
The blacklists also ban Americans from doing business with them.
Officials said the list is intended to maintain the effectiveness of existing sanctions.
"Today's action underscores our resolve to maintain pressure on Russia for violating international law and fueling the conflict in eastern Ukraine," said John E. Smith, the director of the Treasury's Office of Foreign Assets Control.