Given the task definition and input, reply with output. In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

President Barack Obama called Monday for “immediate and full access” to the crash site of Malaysia Airlines Flight 17 in eastern Ukraine, as pro-Russia separatists block international workers’ efforts to examine the site. 
  
 “They are prepared, they are organized to conduct what should be the kinds of protocols … that should follow any international incident like this. What they need right now is immediate and full access to the crash site,” Obama said from the South Lawn of the White House. He also used his appearance before cameras to call for a cease-fire in Gaza between Israel and Hamas. 
  
 Text Size - 
  
 + 
  
 reset Obama's full statement on Ukraine 
  
 In Ukraine, American and other foreign investigators have thus far been unable to secure the access they need. “Separatists are removing evidence from the crash site,” Obama said. “All of which begs the question, what exactly are they trying to hide?” 
  
 (POLITICO poll: Stay out of Ukraine, Mideast) 
  
 Russian President Vladimir Putin has professed a desire for an independent probe of the site but, Obama said, he must make that a reality by instructing the separatists to allow investigators to do their work. 
  
 “The burden now is on Russia to insist that the separatists stop tampering with the evidence, grant investigators who are already on the ground immediate, full and unimpeded access to the crash site,” Obama said. 
  
 If Putin does not follow through and continues to infringe on Ukraine’s sovereignty, Russia “will only continue to isolate itself” from the international community and will face further economic sanctions, Obama added. 
  
 (Full coverage of the MH17 plane crash in Ukraine) 
  
 The blocking of access to the site “is an insult to those who’ve lost loves ones,” he said, adding that four days after the crash, “time is of the essence.” 
  
 Juggling another international crisis, the latest round of tensions between Israel and Hamas, Obama repeated U.S. pleas for an immediate cease-fire and sent Secretary of State John Kerry to the Middle East. 
  
 “I’ve instructed him to push for an immediate cessation of hostilities,” Obama said. The loss of civilian lives on both the Israeli and Palestinian sides “is why it now has to be our focus and the focus of the international community to bring about a cease-fire that ends the fighting.” 
  
 An Israeli official stressed Monday that the only proposal that should be considered for a cease-fire should be the Egyptian one, calling it “the single game in town.” Attention to potential mediation by Qatar, Turkey or other nations is a distraction, the official said, urging that the focus remain on what Kerry can do to strength the proposal from the Egyptians, given the significant leverage over Hamas that Egypt has through the shared border and economic ties. 
  
 Asked what strengthening the proposal would entail, another Israeli official acknowledged, “that’s a question.” 
  
 But the Israeli officials stressed that they do not believe the word “disproportionate” applies to the current situation, arguing that the question is of civilian death vs. civilian death and that the civilians who have been killed because they were put in harm’s way by Hamas figure differently into the calculation. 
  
 The Israelis called for increased international attention to how Hamas has been using civilians and civilian facilities as human shields. 
  
 “It’s not a body-bag count,” the first official said. “That’s irrelevant from the point of proportionality.” 
  
 Edward-Isaac Dovere contributed to this report. ||||| Ukrainian Emergency workers carry a victim's body in a plastic bag at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, Donetsk region, eastern Ukraine Monday, July 21, 2014.... (Associated Press) 
  
 Ukrainian Emergency workers carry a victim's body in a bag at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, Donetsk region, eastern Ukraine, Monday, July 21, 2014. Another... (Associated Press) 
  
 Russian President Vladimir Putin speaks during a recording of nationwide TV address at the Novo-Ogaryovo residence outside Moscow early Monday, July 21, 2014. Putin has lambasted those who use the downing... (Associated Press) 
  
 A members of the OSCE mission to Ukraine uses a chemical to combat the smell of decomposing bodies while inspecting along with Holland's National Forensic Investigations Team a refrigerated train loaded... (Associated Press) 
  
 A man walks next to a refrigerated train loaded with the bodies of victims, in Torez, eastern Ukraine, 15 kilometers (9 miles) from the crash site of Malaysia Airlines Flight 17, Monday, July 21, 2014.... (Associated Press) 
  
 A masked pro-Russian rebel stands as Peter Van Vilet, center left, team leader of Netherlands' National Forensic Investigations Team speaks to members of the OSCE's mission to Ukraine, while inspecting... (Associated Press) 
  
 Peter Van Vilet, center, team leader of Netherlands' National Forensic Investigations Team and deputy head of the OSCE mission to Ukraine Alexander Hug, center right, leave a media briefing after inspecting... (Associated Press) 
  
 Ukrainian Emergency workers carry a victim's body in a plastic bag at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, Donetsk region, eastern Ukraine Monday, July 21, 2014.... (Associated Press) 
  
 Malaysian diplomats stand at left, as Ukrainian President Petro Porosheko expresses his condolences outside the Malaysian Embassy in Kiev, Ukraine, Monday, July 21, 2014. (AP Photo/ Mykola Lazarenko) (Associated Press) 
  
 A pro-Russian rebel covers his nose due to the smell of decomposing bodies as members of the OSCE mission to Ukraine and Holland's National Forensic Investigations Team inspect a refrigerated train loaded... (Associated Press) |||||

President Obama called out Vladimir Putin, Ukraine's pro-Russia militants, and the disgraceful handling of the investigation into the crash of Malaysia Airlines Flight 17 today, reports Politico. The president argued that investigators needed "immediate and full access to the crash site." "What exactly are they trying to hide?" he asked, stating that Putin has "direct responsibility" to get rebels to fall in line and "stop tampering with evidence." By continuing to meddle in Ukraine's autonomy, Russia "will only further isolate itself," the president said. Obama's comments echo those of Dutch investigators on the scene today, adds the AP, who report seeing remains still scattered around fields and are calling for a full forensic sweep.