President Barack Obama has indirectly attacked Republican presidential front-runner Donald Trump, saying he knows very little about foreign policy and not much when it comes to “the world generally.” Obama was referring to Trump’s latest proposal to arm Japan and South Korea with their own nuclear weapons to fight it out with North Korea and China themselves. Trump believes America is not a great nation any longer and needs to sit it out and count the pennies while the rest of the world sort out their own problems, including nuclear proliferation and such other important worldly matters. MSNBC reports: At a press conference to conclude the Nuclear Security Summit on Friday, the president was asked for his reaction to Trump’s suggestion that U.S. allies Japan and South Korea manufacture their own nuclear weapons as a defense against North Korean aggression; and Trump’s refusal to rule out using nuclear weapons against Europe. Without mentioning Trump by name, Obama said the comments “tell us the person who made the statements doesn’t know much about foreign policy, or nuclear policy, or the Korean Peninsula or the world generally.” The president said Trump’s eyebrow raising comments came up “on the sidelines” of the summit that [...]