Vice President Mike Pence said Monday that it's time for North Korea to "get the message" on halting its nuclear and ballistic ambitions.
In the meantime, North Korea's deputy UN ambassador accused the United States of turning the Korean peninsula into "the world's biggest hotspot" and creating "a risky situation in which a thermonuclear war may break out at any moment".
Pence said Trump was hopeful China would use its influence in the region to pressure the North to abandon its weapons program.
The UK has urged North Korean leader Kim Jong-un to stop "these belligerent acts and comply with United Nations resolutions", but No 10 refused to be drawn on reports that Prime Minister Theresa May has privately urged Mr Trump not to launch air strikes on North Korea.
Foreign Minister Julie Bishop said North Korea's nuclear weapons program posed a "serious threat" to Australia unless it is stopped by the global community.
"If the USA comes up with a risky military option, then the first card is in our hands, then we'll deal with it with our pre-emptive strike", he said.
Of those nations, China, which accounts for an estimated 90 percent of North Korea's trade, is integral to adding pressure on the regime.
US President Donald Trump praised China for its help in pressuring North Korea, while defending his softening stance on trade and other issues with the Asian giant, in an interview that aired Tuesday.
China made a plea for a return to negotiations.
USA vice-president Mike Pence has again hinted at the use of military force to deal with North Korea's accelerating nuclear weapons programme, warning that: "all options are on the table".
"We will not rest and will not relent until we obtain the objective of a denuclearized Korean Peninsula", he said. He also pledged support and alliance to South Korea.
For weeks Washington has pushed the view that Beijing is the key to solving the North Korean nuclear problem.
Urging China and Russian Federation to play more constructive roles, he added: "We need to apply pressure on North Korea so they seriously respond to a dialogue [with the worldwide community]".
Meanwhile Chinese foreign minister Wang Yi made a new appeal for calm on the Korean Peninsula and says he believed the United States would prefer a diplomatic resolution to the stand-off.
"We would like to seek the best shape and forum for our bilateral relationship", Pence said.
This missile launch comes at a bad time as tension on the Korean Peninsula has consistently been rising.
Pence reassured Prime Minister Shinzo Abe that the US considers its alliance with Japan to be a cornerstone of security in the region.
"When President Trump agreed to this dialogue, he envisioned this as a mechanism for enhancing bilateral commercial relations between the United States and Japan, and achieving results in the near future".
According to a report in Guardian on Tuesday, the U.S. is exploring ways short of war to pressure the country into denuclearisation, particularly if Pyongyang goes forward with a sixth nuclear test.
And when asked what he plans next, President Trump said, "Wait and see".