The situation in the Korean Peninsula is moving forward, with Seoul and Pyongyang preparing for Friday's summit. And later on a historic meeting between Kim Jong Un and Donald Trump on the horizon. However, Japanese leader Shinzo Abe is becoming increasingly worried he may be left out of the loop. Terrence Terashima reports from Tokyo.

Resolving DPRK's nuclear and missile programs have been top on Japan's diplomatic agenda. Japanese public anxiety peaked after Pyongyang conducted number of missile and nuclear tests in recent years. Some flew over the Japanese isles, prompting numerous public evacuation drills in all parts of Japan, for the first time in history. Kim Jong Un's recent promise to halt its nuclear and ICBM tests, and the historical meeting with U.S. President Donald Trump, paving way for possible peace in the Korean Peninsula, would be wonderful news for the nervous Japanese public. However, for Shinzo Abe, it was not as quite as he had calculated. Among the six nations, Japan is the only country that does not have direct hand in the negotiations. He called on to the so-called tight U.S.- Japan relations to address the Japanese concerns. However, many analysts in Japan say the Abe-Trump talk on DPRK was not as successful as Abe has appealed.

TSUNEO WATANABE, SENIOR FELLOW INT'L PEACE AND SECURITY DEPT., THE SASAKAWA PEACE FOUNDATION "We never know what kind of reaction from North Korea, and we never know what kind of deal Mr. Trump is thinking about. Maybe Mr.Trump doesn't have any concrete strategy or tactics, because he is very much satisfied with his own ability to deal with the adversary."

Regional security very much affects the direction of Japan's political picture. So called DPRK threats kept Abe's public support and beefing up Japan's missile defense plans. So having a hand in resolving this regional security concerns and addressing abduction issues is important for Abe.

TSUNEO WATANABE, SENIOR FELLOW INT'L PEACE AND SECURITY DEPT., THE SASAKAWA PEACE FOUNDATION "First of all, Abe tried to have a closer relation with Mr. Trump, but at the same time Abe realized that move of Trump is very unpredictable. So that is one agenda, but I think more serious agenda for Abe. Because of very unpredictable Trump, Abe would like to improve relations with China."

Analysts say Abe is hoping to address these issues during the future trilateral summit between, China, South Korea and Japan.

TERRENCE TERASHIMA TOKYO "The prime minister suffers from a low public support rate, due to number of scandals and an unpopular constitution revision. So success in diplomacy is something he needs to maintain credibility as a prime minister. Being left behind in the DPRK issues is something Abe wants to avoid. Terrence Terashima, CGTN Tokyo."