A number of Russian and Ukrainian media spread fake information that Ukrainian frigate “Hetman Sahaidachny” refused to follow orders from Kjiv and raised St. Andrew’s flag.
An example of this news: http://vg-news.ru/news/20140354074.html

This fake was disproved by official authorities of Ukraine: http://www.mil.gov.ua/index.php?lang=ua&part=news&sub=read&id=32769. The same message was posted on the official representation of the frigate to Facebook.