A US-North Korea flash summit remains a long shot despite Donald Trump signalling he was open to such talks and describing Pyongyang as “sort of a nuclear power” as he embarked on his Asia trip last week. The choice of words by the US president could be interpreted as a diplomatic concession by Kim Jong-un, some analysts said. Others said the North Korean leader’s focus was on alliances with China and Russia amid the Ukraine war, making it difficult to devote time and resources to a photo-op...