Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Problem:North Korean leader Kim Jong Un watches landing and anti-landing exercises being carried out by the Korean People's Army (KPA) at an unknown location, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on March 20, 2016. REUTERS/KCNA 
  
 SEOUL (Reuters) - North Korea fired five short-range projectiles into the sea off its east coast on Monday, South Korea’s military said, amid heightened tension over the isolated country’s nuclear and rocket programs. 
  
 The unidentified projectiles were launched from south of the city of Hamhung and flew about 200 km (120 miles), landing in waters east of North Korea, South Korea’s Joint Chiefs of Staff said in a statement. 
  
 On Friday, North Korea fired two mid-range ballistic missiles into the sea in defiance of tough new U.N. and U.S. sanctions slapped on the country following nuclear and rocket tests earlier this year. 
  
 “North Korea should refrain from all provocative actions, including missile launches, which are in clear violation of U.N. resolutions,” Sung Kim, the U.S. special envoy for North Korea, told reporters in Seoul when asked about Monday’s firing. 
  
 In recent weeks, North Korea has stepped up its bellicose rhetoric, threatening pre-emptive nuclear strikes against Washington and Seoul and firing short-range missiles and artillery into the sea. 
  
 The North protests annual ongoing joint U.S.-South Korea military drills. 
  
 North Korean leader Kim Jong Un said last week that the country would soon test a nuclear warhead and ballistic missiles capable of carrying nuclear warheads in what would be a direct violation of U.N. resolutions that have the backing of Pyongyang’s chief ally, China. 
  
 Chinese Foreign Ministry spokeswoman Hua Chunying said China was “deeply concerned” about the situation on the Korean peninsula. 
  
 “We hope North Korea does not do anything to contravene U.N. Security Council resolutions. We also hope all sides can remain calm and exercise restraint and avoid doing anything to exacerbate confrontation or tensions,” she told a daily news briefing. ||||| North Korea has launched five projectiles into the Sea of Japan, its latest military manoeuvre amid concerns about its nuclear programme. 
  
 South Korea disputed Pyongyang's description of the projectiles as "missiles" on Monday, saying instead the objects were smaller "short-range projectiles" - most likely conventional shells. 
  
 South Korean officials said the five projectiles flew about 200 kilometres after being launched from an area about 20km south of Hamhung on Monday afternoon local time. 
  
 Tensions have been soaring on the divided Korean peninsula since the North carried out its fourth nuclear test on January 6, followed a month later by a long-range rocket launch that was widely seen as a disguised ballistic missile test. 
  
 The UN Security Council responded earlier this month by imposing its toughest sanctions on North Korea to date. 
  
 In recent weeks Pyongyang has maintained a daily barrage of nuclear strike threats against both Seoul and Washington, ostensibly over continuing large-scale South Korea-US military drills that the North sees as provocative rehearsals for invasion. 
  
 Al Jazeera's Adrian Brown, reporting from Beijing, said Monday's tests follow the launch of ballistic missiles in the same area just a few days earlier. 
  
 "It's the timing of this that is so interesting, because on Friday North Korea said it carried out two ballistic missile tests roughly in the same area," he said. 
  
 "A few days before, the North Korean military warned that it was launching multiple ballistic missile launches and a nuclear warhead test," Brown said, adding that the tests were a "slap in the face of China", Pyongyang's closest ally. 
  
 US and South Korean intelligence assessments do not currently hold the North capable of launching missiles carrying a nuclear weapon. 
  
 Analyst BJ Kim from Hankuk University in Seoul told Al Jazeera that Pyongyang was "raising the stakes" with an eye on possible talks with Western powers. 
  
 "At this point from the North Korean perspective it makes perfect sense to look tough ... this is very predictable behaviour that we've been seeing," he said. 
  
 China concerns 
  
 Chinese Foreign Ministry spokeswoman Hua Chunying said China was "deeply concerned" about the situation on the Korean peninsula. 
  
 "We hope North Korea does not do anything to contravene UN Security Council resolutions," she said. 
  
 "We also hope all sides can remain calm and exercise restraint and avoid doing anything to exacerbate confrontation or tensions." 
  
 Speaking on China's ability to rein in the North, Kim said Pyongyang had become increasingly dismissive of the pressure Beijing could put on it. 
  
 "They [North Korea] are trying to show to the world that China doesn't have much leverage over them and that they're on their own," he said. ||||| SEOUL, South Korea (AP) — North Korea fired five short-range projectiles into the sea on Monday, Seoul officials said, in a continuation of weapon launches it has carried out in an apparent response to ongoing South Korea-U.S. military drills it sees as a provocation. 
  
 The projectiles launched from a site near the northeastern city of Hamhung flew about 200 kilometers (125 miles) before landing in waters off North Korea's east coast, South Korea's Joint Chiefs of Staff said. 
  
 The South Korean military was attempting to determine whether the projectiles were missiles, artillery or rockets. 
  
 The firings came three days after Seoul said North Korea launched its first medium-range ballistic missile into the sea since early 2014, ignoring U.N. resolutions against such tests. 
  
 The firings appear to be North Korea's response to annual springtime U.S.-South Korean military exercises that it says are a rehearsal for an invasion. In the past two weeks North Korea has fired several short-range missiles and artillery shells into the sea and threatened pre-emptive nuclear strikes against Washington and Seoul. 
  
 This year's drills are the largest ever, and come after North Korea conducted a nuclear test and a long-range rocket launch earlier this year, leading the U.N. Security Council to impose its toughest sanctions on the country in two decades. 
  
 The U.S. special representative for North Korean policy, Sung Kim, who is visiting Seoul, said Monday that North Korea "should refrain from all provocative actions, including missile tests, which are clearly in violation of Security Council resolutions." 
  
 On Sunday, North Korean state TV broadcast photos showing leader Kim Jong Un supervising landing and defensive drills. The photos showed artillery blazing, navy ships landing as shells fell nearby, and soldiers running with the national flag. North Korea has a history of photo manipulation and there was no way to verify the authenticity of the photos. 
  
 Last week, state media said Kim ordered tests of a nuclear warhead and ballistic missiles capable of carrying such warheads. He issued the orders while overseeing what state media called a successful simulated test of a re-entry vehicle aimed at returning a nuclear warhead to the atmosphere from space so it could hit its intended target. The re-entry vehicle is considered one of the last major technologies North Korea must master to develop long-range missiles equipped with nuclear weapons capable of reaching the U.S. mainland. 
  
 Analysts in South Korea said the medium-range missile launch last Friday may have been a test of the re-entry technology. North Korean state media have not commented on the reported launch. 
  
 South Korean defense officials say North Korea doesn't yet have functioning intercontinental ballistic missiles. 
  
 ___ 
  
 Associated Press video journalist Chang Yong-jun contributed to this report. ||||| Story highlights The South Korean military says North Korea launched the five projectiles Monday 
  
 The launch comes just days after Pyongyang fired ballistic missiles 
  
 The U.S. and South Korean militaries are conducting annual joint exercises in the region 
  
 (CNN) North Korea fired five short-range projectiles from the country's east coast Monday, South Korean military heads said, the latest in a series of actions by Pyongyang to raise tensions on the divided peninsula in recent months. 
  
 The projectiles were fired from an area south of Hamhung city, South Hamgyong province, on the country's east coast, between 3:19 and 4:05 p.m. South Korean time (2:19 to 3:05 a.m. ET) Monday, according to the South Korean Joint Chiefs of Staff, or JCS. 
  
 The JCS had previously reported the launch of four projectiles. 
  
 The projectiles flew about 200 kilometers (124 miles) toward the sea to the east of the Korean Peninsula, the JCS said in a statement. 
  
 The South Korean military is closely monitoring the situation and is maintaining full readiness, the statement added. |||||
Solution:
Just three days ago, North Korea defied a UN ban and fired a medium-range ballistic missile into the sea. Now South Korea officials say Pyongyang launched five short-range projectiles Monday into the waters off the latter's east coast, reportedly as a reaction to US-South Korea military drills each spring, the AP reports. It isn't yet clear whether the projectiles were missiles, artillery, or rockets; Pyongyang called them missiles, but South Korea says they were most likely conventional shells, Al Jazeera reports. Either way, more warnings have now been issued: "North Korea should refrain from all provocative actions, including missile launches, which are in clear violation of UN resolutions," the US special envoy for North Korea said Monday. North Korea has been ratcheting up the war rhetoric as of late, firing short-range missiles and artillery and noting both Seoul and Washington, DC, are squarely in its sights for preemptive nuclear strikes, per Reuters. CNN notes 15 projectiles have been launched on four separate occasions since early February. Meanwhile, even China is urging its ally to simmer down as the US and South Korea hold their largest drills ever, with 300,000 South Korean troops and at least 17,000 US soldiers. "We hope North Korea does not do anything to contravene UN Security Council resolutions," a Chinese Foreign Ministry rep said, per Reuters. "We also hope all sides can remain calm and exercise restraint and avoid doing anything to exacerbate confrontation." (North Korea sentenced a US student to 15 years of hard labor.)