The yield on the notes climbed to more than 10 percent on March 21, 2014, the day after Gunvor co-founder Gennady Timchenko was sanctioned by the U.S. for his ties to Vladimir Putin.
Refer to the input text as context and select the correct relationship between 'Gunvor' and 'Gennady Timchenko' from the available options.
Options: founded by, business division, manufacturer, publisher