The US president argued the crisis on the Korean peninsula should have been resolved 25 years ago.
Speaking alongside Spanish Prime Minister Mariano Rajoy, Trump reiterated that the U.S. is "totally prepared" if they have to use the military option, saying military action in North Korea would be "devastating".
Defense Department spokesman Dana White said in a statement: 'This mission is a demonstration of United States resolve and a clear message that the president has many military options to defeat any threat. But I'll fix the mess.
"North Korea has turned to a calculated gamble in order to gain more leverage, maximize your leverage vis-à-vis the USA, and at the same time, divide nations around North Korea", said Cho. "As long as the USA has declared war, from now on, even if USA strategic bombers don't fly into our airspace, we will hold all the rights to self-defense, including the right to shoot them down at a time of our discretion".
China echoed Russia's concerns, and said war on the peninsula would have "no winners".
After a war of words broke out between Donald Trump and Kim Jong Un last week, North Korea has released a dramatic propaganda video showing its missiles blowing up United States targets.
"[Kim] is acting very badly", said Trump at the White House Tuesday.
Alarm over Pyongyang's nuclear and ballistic missile programs dominated the gathering of world leaders at the United Nations, amid fears the heated rhetoric could accidentally trigger a war.
North Korea's foreign minister said Sunday that Trump had declared war on North Korea, warning in a tweet that he and the country's leader Kim Jong Un "won't be around much longer" if the regime continued its threatening.
Asia has been on tenterhooks as tensions soar, reaching new heights at the weekend when North Korea threatened to shoot down USA bombers carrying out missions close to its airspace.
Indeed, the North has become so befuddled by the president's actions and tough talk on social media and before the U.N. Security Council it has reached out to Republican think tanks and former officials in order to better understand Trump, the Washington Postreported Tuesday.
As mentioned above, North Korea took that statement as a "clear declaration of war".
North Korean leader Kim Jong Un is reportedly so confused by President Donald Trump's constant rage tweets that he is trying to enlist the help of Republican foreign policy experts in an effort to understand them. "They are also working with North Korea".
In his United Nations address, Ri warned that Trump's threat to destroy North Korea made "our rockets' visit to the entire U.S. mainland all the more inevitable".
The Trump White House quickly dismissed the idea that war had been declared, with Press Secretary Sarah Sanders saying Monday the idea was "absurd."
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