Allied worldinfo-icon powers met on Tuesday for crisis talks on the North Korean nuclear missileinfo-icon threat, but without key player Chinainfo-icon, there seemed little chance of a breakthrough.

Canadainfo-icon and the United Statesinfo-icon are hosting a two-day meeting in Vancouver to bolster solidarity in the face of Kim Jong-Un's regime. But neither China -- the North's main ally and sole significant trade partner -- nor Russiainfo-icon were invited for the ministerial-level talks, limiting the scope for effective new initiatives.

"The most important relevant parties of the Korean peninsula issue haven't taken part in the meeting so I don't think the meeting is legal or representative," Chinese foreign ministry spokesman Lu Kang told a regular briefing.

Lu denounced the "Cold Warinfo-icon mentality" of "relevant parties," without naming the United States, which is urging Beijing to cut off fuel oilinfo-icon supplies to Pyongyang to force it to negotiate its own nuclear disarmament.

With China absent from Vancouver, USinfo-icon President Donald Trumpinfo-icon spoke with his counterpart Xi Jinping.

According to the White House, the pair expressed hope that a recent resumption in face-to-face talks between North and South Koreainfo-icon "might prompt a change in North Koreainfo-icon's destructive behaviour." But Trump also "committed to sustain the United States-led global campaign of maximum pressure to compel North Korea to commit to denuclearisation."

Trans-Pacific tensions have been running high for months, despite the recent return to direct talks between Kim's regime and Moon Jae-In's South Korea.

Over the weekend, a false alarm in Hawaii warning of an incoming ballistic missile rattled nerves, and earlier this month, Trump and Kim traded saber-rattling bluster.

As the talks got underway, Pyongyang issued its first response to Trump's argument that his nuclear arsenal dwarfs the North's fledgling missile batteries.

The so-called Vancouver Group represents 20 countries that sent troops or support to the UN-backed side in the 1950-53 Korean War.