In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: The U.S. will protest what it called the unsafe interception of a U.S. spy plane by a Russian fighter over the Baltic Sea last week, an incident American officials said Sunday was an example of increasingly aggressive air operations by Moscow. 
  
 The encounter, which took place on the morning of April 7 but was only publicly discussed by the U.S.in recent days, is the latest incident of escalating friction between Russia and members of the North Atlantic Treaty Organization. 
  
 ... ||||| A Russian SU-27 fighter jet is shown in this file photo. (Photo: Ted S. Warren, AP) 
  
 The Pentagon says a Russian fighter jet intercepted a U.S. reconnaissance plane over the Baltic Sea last week in an aggressive, unsafe maneuver that recalls Cold War tensions. 
  
 The U.S. European Command said on Twitter that the U.S. "is raising this unprofessional incident with Russia in the appropriate diplomatic and official channels.'' 
  
 Defense Department spokesman Mark Wright said Sunday that the Air Force RC-135U reconnaissance plane was flying a routine route in international airspace when a Russian SU-27 fighter jet flew close by "in an unsafe and unprofessional manner.'' 
  
 "Unprofessional air intercepts have the potential to cause harm to all air crews involved. More importantly, the careless and unprofessional actions of a single pilot have the potential to escalate tensions between countries,'' Wright said. 
  
 "The nature of Russian air activity is expanding west into Europe and becoming more aggressive," he said. "This air activity takes place in the context of a changed security environment in view of Russia's aggression against Ukraine.'' 
  
 The encounter took place April 7. 
  
 Russian Maj. Gen. Igor Konashenkov of the Russian Defense Ministry said "there were no emergency situations" during the interception of the U.S. plane, the Interfax News agency reported. 
  
 Russia accused the U.S. plane of approaching Russian airspace with its electronic transponder signal, which identifies a plane, turned off, The Wall Street Journal reported. Navy Capt. Greg Hicks, the U.S. European Command spokesman, said the plane's transponder was operational. 
  
 .To dispel rumors: US aircraft flying IAW ICAO flight rules in intl airspace was intercepted by Russian fighter in unsafe manner April 7.1/2 — U.S European Command (@US_EUCOM) April 11, 2015 
  
 .The United States is raising this unprofessional incident with Russia in the appropriate diplomatic and official channels. 2/2 — U.S European Command (@US_EUCOM) April 11, 2015 
  
 Read or Share this story: http://usat.ly/1FNguQj ||||| WASHINGTON (AP) — The U.S. is protesting an intercept of a U.S. reconnaissance plane by a Russian fighter jet last week, calling it "unsafe and unprofessional" amid what it views as increasingly aggressive air operations by Moscow. 
  
 FILE - This March 27, 2008, aerial file photo shows the Pentagon in Washington. The U.S. is protesting an intercept of a U.S. reconnaissance plane by a Russian fighter jet last week, calling it "unsafe... (Associated Press) 
  
 Pentagon spokesman Mark Wright on Sunday said the U.S. was filing a complaint to Russia after the April 7 incident over the Baltic Sea. 
  
 Russian officials have denied their pilot did anything wrong, according to several news reports. 
  
 According to the Pentagon, the U.S. RC-135U plane was flying in international airspace north of Poland. U.S. officials say a Russian SU-27 fighter intercepted the U.S. aircraft at a high rate of speed from the rear, and then proceeded to conduct two more passes using "unsafe and unprofessional maneuvers" in close proximity. 
  
 "Unprofessional air intercepts have the potential to cause harm to all aircrews involved. More importantly, the careless actions of a single pilot have the potential to escalate tensions between countries," Wright said. 
  
 "This air activity takes place in the context of a changed security environment in view of Russia's aggression against Ukraine," he said. 
  
 It isn't the first time the U.S. has protested to Moscow what it considered to be an unsafe intercept. Last April, a Russian fighter jet intercepted a U.S. reconnaissance plane in international airspace over the Sea of Okhotsk. |||||
A: 
A Russian fighter jet flying over the Baltic Sea last week flew a little too near a US reconnaissance plane in what the Pentagon calls "an unsafe and unprofessional manner," USA Today reports. Now the US is taking up the matter with Russian authorities, US officials tweeted. "Unprofessional air intercepts have the potential to cause harm to all air crews involved. More importantly, the careless and unprofessional actions of a single pilot have the potential to escalate tensions between countries," says a Pentagon rep. It's a matter of particular concern given the fact that "Russian air activity is expanding west into Europe and becoming more aggressive," the spokesman says, pointing to "the context of … Russia's aggression against Ukraine.'' The Russian plane was moving quickly when it came up behind the US aircraft, passing it twice, US officials say, per the Wall Street Journal. The exact distance between the two planes isn't clear, but it may have been as little as 20 feet, the Journal notes. A Russian military leader said the incident had involved "no emergency situations." A similar incident occurred between a Russian fighter jet and US reconnaissance plane a year ago this month, the AP reports.