Tomohiko Taniguchi, special adviser to Japanese Prime Minister Shinzō Abe, said dialogue should not be opened with the dictator.
The hermit nation fired yet another missile from Pyongyang towards the Sea of Japan on Monday evening, crossing Japanese territory in the boldest show of force under Kim Jong-un’s authoritarian rule.
Mr Taniguchi said Theresa May – who is visiting the country for three days of crucial trade and security talks – had an opportunity to “stand up tall” with Mr Abe against the nuclear threat.
He added any discussions with North Korea at this stage would be a “non-starter”.
Speaking on the Today programme on BBC Radio 4, he said: “It is about a big picture for both countries to make sure that Britain and Japan could work more together for the international community to preserve the rules based in international order.
“North Korean crisis situation fits into that category rather ironically nicely because it’s going to be a golden opportunity for Theresa May and Shinzō Abe to stand up tall and make sure that North Korea’s provocations must continue to be condemned.
“Other than that, inviting North Korea at this moment for any dialogue, either with the United States or with other countries, is almost as if giving a trophy to a naughty boy in your neighbourhood.
“So that’s a non-starter”.
Meanwhile, the Japanese Prime Minister has warned Japan will do everything in their power to protect the country after North Korea fired a missile that passed over the island nation.
Mr Abe warned enough is enough amid rising fears of World War 3.
As he entered his office for an emergency meeting, Mr Abe said: “We will make utmost efforts to firmly protect the lives of the people.”