Senior officials from Japan and the United States have agreed to closely watch moves leading to North Korea's possible denuclearization ahead of the Russia-North Korea summit.
The Japanese Foreign Ministry's Asian and Oceanian Affairs Bureau chief, Kenji Kanasugi, and US Special Representative for North Korea, Stephen Biegun spoke by phone on Sunday.
They talked about the first summit between Russian President Vladimir Putin and North Korean leader Kim Jong Un, which takes place in Vladivostok this week.
Biegun held talks over the issue with Russian Deputy Foreign Minister Igor Morgulov last week in Moscow.
Kanasugi and Biegun confirmed that their countries and South Korea will continue to work closely on the North Korean issue.