Saying "this problem is coming to a head", national security adviser Lt. Gen. H.R. McMaster said Sunday "all of our options are on the table, undergoing refinement and further development" in reaction to the North Korean nuclear program.
Asked by reporters Sunday about the U.S. response to the test, the foreign policy adviser cited previous missile failures by North Korea.
Xi, however, has yet to meet North Korea's young leader Kim Jong Un since the Chinese president took power in 2012 and ties between the two countries have become more distant since Pyongyang began accelerating its missile and nuclear programmes since Kim became leader at the end of 2011.
He said US President Donald Trump has made clear he will not allow the nuclear-armed Pyongyang regime to put the US and its regional allies under threat.
The vice president said at a fellowship dinner at U.S. Army Garrison Yongsan in Seoul that the willingness of military members "to stand firm without fear inspires the nation and inspires the world".
Pence said North Korea's "provocation" was another reminder of the risks that USA and South Korean service members face every day "in the defense of the freedom of the people of South Korea and the defense of America in this part of the world".
North Korea launched a long-range rocket and conducted two nuclear tests a year ago, including its most powerful to date.
No planned response is expected from the Trump administration because the official, who spoke on condition of anonymity to discuss the administration's initial understanding of the launch, said there was no need for the U.S.to reinforce the failure.
Another missile test from Sinpo failed earlier this month, when the rocket spun out of control and plunged into the ocean. We have learned to live with them.
Footage released by North Korea's state television showed a tank leaving formation with white smoke, while the vehicles were rolling through Kim Il-sung Square on Saturday to mark the 105th birthday of late state founder Kim Il-sung.
Asked if he was confident that China will pressure North Korea in a meaningful way, McMaster replied, "We'll see what happens".
The Trump administration has touted some successes on that front in the past week, including the suspension of coal shipments from North Korea to China.
China accounts for an estimated 80 percent of North Korea's foreign trade, along with crucial food and fuel assistance.
Trump says the first issue he brought up with Xi was the DPRK. "On North Korea, they worked together".
McMaster praised China's decision to abstain last week from a UN Security Council resolution condemning Syria's recent chemical weapons attack, calling it a "courageous" move.
North Korean Test Missile Explodes on Launch
It allowed the vice president to gaze at North Korean soldiers afar and stare directly across a border marked by razor wire. United States battleships were moved into the waters near the Korean peninsula as a precaution.