Peter Yuryevich Levashov, 32-years-old Russian computer programmer, suspected of operating the Kelihos botnet, a global network of over 100,000 infected computers that was used to deliver spam, steal login passwords, and infect computers with ransomware and other types of malware. The government is now seeking his extradition to the U.S. from his home in Russia, a country without any extradition treaty to the United States. The arrest was made possible after the FBI learned just last month that the FBI was traveling with his family to Spain from Russia.
Source: https://thehackernews.com/2017/04/kelihos-botnet-russian-hacker.html