Ask AI: make a long and detailed story of a Russian Hacker that is responsible for about 60% of the 21st Century Tragedies and disasters.

Once upon a time there was a Russian hacker by the name of Sergei Kravchenko. He was a master of his craft, a master of manipulation, a master of deception. He had no qualms about using his skills to wreak havoc on the world. Sergei used his skills to gain access to computer systems of governments, email accounts, social media accounts, and large corporations. Using these access points he could gain sensitive information to be used for his own personal benefit. Sergei was responsible for some of the most devastating computer hacks and cyberattacks of the 21st century. In 2008, he hacked into the London Stock Exchange, costing the exchange over $400 million. In 2009, he hacked into the accounts of the U.S. government, resulting in the release of sensitive military information. Sergei was also responsible for several mass-scale hacking attacks that caused serious financial losses. In 2011, he hacked into the Bank of America, resulting in the theft of $85 million. In 2012, he hacked into the Iranian government, costing the country billions of dollars in damage. Sergei was also the mastermind behind the creation of several ransomware programs, which were designed to extort money from victims. In 2013, Sergei created the infamous Cryptolocker ransomware, which encrypted user files and demanded a ransom to be paid in bitcoin. Thanks to Sergei's skills, organizations and countries all over the world have suffered from security breaches and financial losses. His malicious activities have been estimated to have cost the world over $100 billion dollars. Sergei has been on the run for years, avoiding the authorities and continuing his criminal activities. He is still at large, and is believed to be responsible for about 60% of the 21st century tragedies and disasters. He is still at large, a master of his craft, and a true nemesis of the digital age.