In June and July 2015, 31 tourist yachts visited Crimea, including 11 vessels from the US and seven from the UK, the Russian Border Guard Service reported.
Ukrainian Prime Minister Arseniy Yatsenyuk earlier ordered to penalize all ships that visit Ukraine after calling at Crimea.
"Such threats do not scare foreign sea tourists. They probably are not going to visit Ukraine," the border guard service commented.
A Tripadvisor discussion on visiting Crimea for Americans shows that such journeys have posed no problems.
Following the ouster of legitimate president Viktor Yanukovych, Crimea held a referendum on the peninsula's future in March 2014. Over 96 percent of the population voted for reunification with Russia.
Neither Ukraine nor the United States have recognized the Crimeans' choice.