He also criticized the United States call for more sanctions against Pyongyang as "useless and ineffective", and added that it was "ridiculous" for Washington to impose sanctions on Moscow for trading with North Korea, then turn around and ask for help imposing sanctions on the isolated regime.
One country likely to be very concerned by Trump's threat is China who, a recent investigation revealed, is heavily reliant on North Korea for its low-paid garment workers.
President Donald Trump has discussed North Korea's strongest nuclear test yet with Chinese President Xi Jinping (shee jihn-peeng), as the US proposes crippling new sanctions and world leaders tussle over whether pressure or dialogue is the best way to rein in the rogue nation.
When asked if he still considers using military action, Trump replied: "We'll see what happens".
"It's a road to nowhere".
Since Trump's assumption, U.S. and Russian Federation have been at odds on key worldwide issues, notably, the war in Syria and move of tighter sanctions on North Korea.
"It could lead to a global, planetary catastrophe and a huge loss of human life".
Vladivostok, Sep 7 Japanese Prime Minister Shinzo Abe today called for the world to put the "greatest possible pressure" on North Korea to abandon its nuclear missile programme.
The United States has floated the idea of requiring all countries to cut economic links with North Korea to try to strong-arm Pyongyang into changing its behaviour.
After meeting South Korean President Moon Jae-in, Russian leader Vladimir Putin called for talks with North Korea, saying sanctions are not a solution to the country's nuclear and missile development.
Meanwhile, South Korea's air force and army on Monday conducted exercises involving long-range air-to-surface and ballistic missiles in the wake of North Korea's sixth nuclear test, its joint chiefs of staff said in a statement.
"Calculating based on this number, the estimated yield was 160 kilotons", Defence Minister Itsunori Onodera told reporters.
South Korea has said it has carried out a live fire ballistic missile test in response to North Korea's threats.