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In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

WASHINGTON — The trail that led American officials to blame North Korea for the destructive cyberattack on Sony Pictures Entertainment in November winds back to 2010, when the National Security Agency scrambled to break into the computer systems of a country considered one of the most impenetrable targets on earth. 
  
 Spurred by growing concern about North Korea’s maturing capabilities, the American spy agency drilled into the Chinese networks that connect North Korea to the outside world, picked through connections in Malaysia favored by North Korean hackers and penetrated directly into the North with the help of South Korea and other American allies, according to former United States and foreign officials, computer experts later briefed on the operations and a newly disclosed N.S.A. document. 
  
 A classified security agency program expanded into an ambitious effort, officials said, to place malware that could track the internal workings of many of the computers and networks used by the North’s hackers, a force that South Korea’s military recently said numbers roughly 6,000 people. Most are commanded by the country’s main intelligence service, called the Reconnaissance General Bureau, and Bureau 121, its secretive hacking unit, with a large outpost in China. 
  
 The evidence gathered by the “early warning radar” of software painstakingly hidden to monitor North Korea’s activities proved critical in persuading President Obama to accuse the government of Kim Jong-un of ordering the Sony attack, according to the officials and experts, who spoke on the condition of anonymity about the classified N.S.A. operation. ||||| Clearly, hackers who sympathize with North Korea don't have a great sense of humor. Weeks after Sony briefly cancelled The Interview, Moneyhorse Games has frozen work on its Kim Jong-un parody shooter Glorious Leader. The studio says that hackers destroyed game data and locked the company out of its computers, making it tough to both continue work on the dictator-inspired side-scroller and maintain a crowdfunding drive for the title. The funding goals weren't likely to be met as-is, for that matter. This isn't the first time Moneyhorse has faced an attack, but it's serious enough that the company is "reevaluating" its willingness to go forward with a game that has dealt with multiple threats. |||||
Output:
The US was able to pin the Sony Pictures cyberattack on North Korea with confidence because the National Security Agency hacked its way into North Korean systems years earlier, according to the New York Times, which cites American and foreign officials as well as computer experts and a newly disclosed NSA document. The sources say that after gaining access to North Korean networks in 2010, the initial focus was on Pyongyang's weapons programs, but the US focus shifted to North Korea's "cyberarmy" after a massive hack in 2013 paralyzed South Korea's banking system. But although the NSA has reportedly placed malware in North Korean systems intended to serve as an early warning system for cyberattacks, the monitoring didn't give US agencies any advance warning of the Sony attack, officials tell NBC. The penetration did, however, make it easier to trace what one insider calls North Korea's "incredibly careful and patient" preparation for the attack. "Attributing where attacks come from is incredibly difficult and slow,” a cyberwarfare expert tells the Times. "The speed and certainty with which the United States made its determinations about North Korea told you that something was different here—that they had some kind of inside view." In what appears to be an unrelated attack, developer Moneyhorse Games halted work on its "Glorious Leader!" action game starring Kim Jong Un after unidentified hackers destroyed game data and locked the company out of its own computers, Engadget reports.