Bolton is currently on his visit to Tokyo where US President Donald Trump will arrive later on Saturday for talks with Japanese Prime Minister Shinzo Abe. In early May, Abe expressed readiness to hold negotiations with Kim without any preconditions.
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Bolton said, as quoted by the Kyodo news agency, that the potential Abe-Kim meeting would also assist in solving the issue of abducted Japanese nationals detained in North Korea.
Moreover, Bolton insisted that the door to the third summit between Trump and Kim was open.
Speaking about the reported planned visit by Abe to Iran amid the Washington-Tehran row, Bolton said that this issue would be discussed during Trump’s Japan visit.
North Korea held several launches, including tests of short-range missiles, in early May.
In February, Trump and Kim held their second summit in Hanoi, which followed the first meeting in Singapore in June. However, the Vietnam meeting finished without any declaration or agreement.