They come as North Korea has ignored offers from the new administration to resume negotiations, and Secretary of State Antony Blinken last week pressed China to use its "tremendous influence" to convince North Korea to abandon its nuclear program.
In an interview with media outlets including China Global Television Network, Xi called for cooperation between Russian Federation and China in response to hegemony pursued by some Western countries led by the U.S. Lavrov also promoted settlement of deals in currencies that can replace the U.S$. and help reduce risks posed by sanctions.
The senior official said that Biden administration officials had reached out to nearly all officials who have been in contact with North Korea since the 90s, including Trump administration officials who were involved in former President Donald Trump's three face-to-face meetings with North Korean leader Kim Jong Un.
"North Korea has a familiar menu of provocations when it wants to send a message to a USA administration, ballistic missiles of various range, mobile- and submarine-launched platforms, nuclear and thermonuclear tests".
But the USA side will also "do what we can, to be perfectly honest, to try to improve communications between Seoul and Tokyo because we believe a strong working relationship with Japan and South Korea is clear national security interests of the United States", said the official.
North Korea has been subjected to United Nations sanctions since 2006. "We have a long history of disappointment in diplomacy with North Korea".
Through North Korean state media, Kim's politically influential sister Kim Jo Yong warned the Biden administration that if it wanted "to sleep in peace" for the next four years "it had better refrain from causing a stink at its first step".
Kim Yo Jong's statement was issued as Blinken and Defense Secretary Lloyd Austin arrived in Asia to talk with US allies Japan and South Korea about North Korea and other regional issues.
Kim's message "stressed the need to strengthen the unity and cooperation between the two parties and two countries to cope with the hostile forces' all-round challenges and obstructive moves", KCNA said.
Cheong said it was notable that Xi did not publicly express his support for Kim's stated plans to expand the North's nuclear capabilities and instead stressed regional stability.
The meetings in Anchorage reflected increasingly troubled relations between the United States and China, which are at odds over a range of issues from trade to human rights in Tibet, Hong Kong, and China's western Xinjiang region, as well as over Taiwan, China's assertiveness in the South China Sea, and the coronavirus pandemic.
The annual spring U.S.
The move prompted immediate retaliation by Beijing, triggering a furious diplomatic row between China - the North's key backer - and European Union nations.
Washington is reviewing its approach to North Korea after a tumultuous relationship between president Donald Trump and North Korean leader Kim Jong Un, which went from trading insults and threats of war to a diplomatic bromance and several meetings, but made no substantive progress towards denuclearizing the North.
The North's economic woes have been compounded by pandemic border closures and devastating natural disasters that wiped out crops last summer. The DPRK launched short-range missiles over the weekend, the Washington Post reported, following a round of U.S.
North Korea fired two cruise missiles off its west coast Sunday, military sources said in Seoul.
The messages come after senior USA diplomats visited Japan and South Korea before the meeting with their Chinese peers, as Washington seeks to shore up its alliances in Asia.