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.
Utilize the input text as a context reference, choose the right relationship between 'Gunvor' and 'Gennady Timchenko' from the options.
Options: business division, publisher, founded by, manufacturer