UNITED NATIONS, 4 Feb (REUTERS) -- The key to solving the issue of North Korea's ballistic missile and nuclear programs is "in the hands" of the United States, China's UN Ambassador said on Friday (Feb 4), urging Washington to show "more sincerity and flexibility" if it wants a breakthrough.

"They should come up with more attractive and more practical, more flexible approaches, policies and actions in accommodating concerns of DPRK," said ambassador Zhang Jun, referring to North Korea's formal name - the Democratic People's Republic of Korea.

"The key in solving this issue is already in the hands of the United States," he told reporters ahead of a closed-door UN Security Council meeting on North Korea.

The 15-member council met on Friday at the request of the United States to discuss North Korea's launch of an intermediate-range ballistic missile last Sunday.

Nuclear tests and ballistic missile launches by North Korea are banned by the UN Security Council. Diplomats said the United States has proposed the council issue a statement.

"Whether the Security Council should issue something or not, should depend on whether it's helpful for the de-escalation of the tensions," Zhang said. "I do wish that all parties concerned, including council members, should stay prudent in words and actions and avoid further escalation."

North Korea confirmed on Monday it had launched a Hwasong-12 ballistic missile, the same weapon it had once threatened to target the US territory of Guam with, sparking fears the nuclear-armed state could resume long-range testing.