Moon has been pushing inter-Korean engagement, which is complicated by the multiple international sanctions against the North.
Moon will fly to the North Korean capital on Tuesday for the latest stage in a diplomatic thaw on the peninsula, although progress has stalled in denuclearisation talks between Pyongyang and Washington.
The arms deal comes amid stalled denuclearisation talks with N. Korea.
The latest round of diplomatic efforts to curb the North Korean nuclear programme has been high on the agenda in Vladivostok.
Abe and Chinese leader Xi Jinping, who is also attending the Vladivostok forum, are expected to hold a meeting on Wednesday, said a Japanese diplomatic source.
The White House says US President Donald Trump received a letter from North Korean leader Kim Jong-un about scheduling a second meeting between the two leaders.
Thousands of accompanying citizens waved bouquets and flags, chanting "Long live" to the leader.
The two leaders have traded correspondence as they negotiate over North Korea's nuclear program. Trump has also praised Kim on social media.
A New Zealand Air Force P-3K2 aircraft would carry out patrols of international waters in North Asia for signs of vessels undertaking activities that break UN sanctions against North Korea.
The North Korean leader says he is willing to cooperate with both Seoul and Washington on denuclearisation.
Denuclearisation talks have stalled since US President Donald Trump cancelled Secretary of State Mike Pompeo's trip to North Korea last month.
Seoul will continue to push for a joint declaration with US to end the Korean War this year.
Moon and Kim have since agreed to hold a third summit in Pyongyang at an unspecified date in September.
A diplomatic source speaking on condition of anonymity said Russia's objection stemmed mainly from the part that said North Korea had exceeded its 2018 oil import cap set by the 2017 sanctions.
Trump called off a planned trip to North Korea by Secretary of State Michael Pompeo after concluding there wasn’t enough progress in talks aimed at denuclearising the Korean Peninsula.
Trump's refusal to direct criticism at North Korean leader Kim Jong Un but blame other parties for a lack of progress comes despite reports the US received a belligerent letter from Pyongyang.
Mattis said he’s working in coordination with Secretary of State Michael Pompeo’s diplomatic efforts, but he also signalled that smaller-scale exercises are going ahead.
Trump on Friday pulled the plug on the visit, blaming a lack of progress in denuclearisation efforts since his historic summit with North Korean leader Kim Jong Un in June.
In the weeks since the Trump-Kim summit in Singapore, the administration has struggled to show any signs of progress in its efforts to dismantle North Korea’s nuclear weapons program.
Moon has championed peace efforts for the Korean Peninsula since taking office last year, and played a crucial role in bringing Kim and Donald Trump together for their historic first summit in June.
Moon said he hoped for speedy progress in talks between the United States and North Korea, with steps by Pyongyang to abandon its nuclear programmes.
Javad-Ri meeting underscores the challenges facing Trump administration efforts to pressure the nations to curb their weapons programs and give up their nuclear aspirations.
SYDNEY: Australia has pressed North Korea over the remains of 43 soldiers still missing after the Korean war in a rare encounter between the...
North Korea and the US vowed to work to end Pyongyang's weapons programmes at a landmark June summit in Singapore, but have struggled to reach an agreement to accomplish that goal.