WASHINGTON, Sept. 6 (Xinhua) -- The White House said on Wednesday that U.S. President Donald Trump spoke with British and Australian leaders by phone regarding the nuclear issue on the Korean Peninsula.

The White House said that in his discussion with British Prime Minister Theresa May on Tuesday, Trump stressed that now is not the time to talk to the Democratic People's Republic of Korea (DPRK), and made clear that all options remain open to defend the United States and its allies.

The two leaders agreed to continue working closely together on increasing diplomatic and economic pressure on the DPRK, said the White House in a statement.

In a related development, Trump also spoke on Tuesday with Prime Minister Malcolm Turnbull of Australia by phone, said the White House.

In their discussion on the Korean Peninsula nuclear issue, the leaders confirmed that their two countries will intensify joint efforts to denuclearize the DPRK, said a statement by the White House.

Trump also reaffirmed his commitment to defending the homeland, territories, and allies of the United States, using all available diplomatic and military capabilities, said the statement.

The DPRK on Sunday detonated a hydrogen bomb that can be carried by an intercontinental ballistic missile (ICBM), the country's Central Television announced.

The DPRK's nuclear testing and launches using ballistic missile technology have violated UN Security Council resolutions.

Liu Jieyi, China's permanent representative to the United Nations, on Monday condemned the latest nuclear test by the DPRK and urged the country to return to the track of dialogue. China will not allow chaos and war on the Korean Peninsula, he said.

Liu said the suspension-for-suspension proposal and dual-track approach put forward by China together with the Russian proposal of a step-by-step approach is a realistic and feasible roadmap for the settlement of the Korean Peninsula nuclear issue, asking relevant parties for due consideration of the plans.

The idea of dual-track approach involves parallel efforts to move forward both denuclearization and the establishment of a peaceful mechanism on the peninsula; the initiative of suspension-for-suspension calls for the DPRK to suspend its nuclear and missile activities and for the United States and South Korea to suspend their large-scale war games.