US President Barack Obama told reporters in Japan Thursday that China’s role in ‘stopping’ North Korea from forging ahead with a nuclear weapons program is "critically important"

US President Barack Obama told reporters in Japan Thursday that China’s role in ‘stopping’ North Korea from forging ahead with a nuclear weapons program is "critically important."
  
"North Korea has engaged in provocative actions for the last several decades. It's been an irresponsible actor on the international stage for the last several decades," he said. "They are the most isolated country in the world. They are subject to more international sanctions and international condemnation than any country in the world.
  
"Working with Japan, working with the Republic of Korea and working with China ... we can continue to apply more and more pressure on North Korea so that at some junction, they end up taking a different course. "China's participation in pushing the DPRK (North Korea) in a different direction is critically important," he said.