The adviser warned that Prime Minister Shinzo Abe will use his reconfirmed mandate to improve the country’s defence measures against North Korea.
Mr Taniguchi said: “The bottom line is, when you’re faced with a threat of this kind, you must be prepared and that’s something you must continue to do.
“No preparation is complete, and Japan has got much to do to improve its deterrence capacity.”
Mr Taniguchi said the Japanese Government was committed to its partnership with United States President Donald Trump to establish strong defensive lines against Kim Jong-un’s nation.
He said both countries will seek to put more pressure on North Korea to stop the missile testings that have been threatening to spark World War 3.
Speaking to BBC Radio 4 Today, he said: “Shinzo Abe and Donald Trump are always on the same page, a 100 per cent allies.
“Practical implication is that they share the sense of urgency as to North Korea in particular and they also share an idea that now is the time not for turning, not for dialogue, but for exerting more pressure on North Korea.”
It comes after President Trump said the United States was ready to strike North Korea should the situation require it.
Mr Trump said: “We will see what happens. We are prepared for everything. You would be shocked to see how prepared we are, if we need to be. Will this happen? Who knows?”
North Korea has embarked on an increasingly aggressive nuclear testing programme, shooting missiles at such a frequent rate that its missile testing grounds are threatened with complete destruction.
The tensions have long been set to reach boiling point. Kim’s development of a full nuclear arsenal could be the final straw for South Korea and its military allies who have long feared a devastating attack.