Sources have said Chinese companies shipping oil to the North will also probably be targeted by future US sanctions.
"We will expect tensions to remain relatively high for as long as North Korea believes that it has a chance of succeeding in getting what it wants by raising tensions, we will see continual provocations of the country", Tan said in the seminar. It was distributed by the Korean Central News Agency, the state news service.
The UN Security Council unanimously imposed an eighth set of sanctions on North Korea on Monday, banning it from trading in textiles and restricting its oil imports, which US President Donald Trump said was a prelude to stronger measures.
'I'd like to appeal to the world, together with Prime Minister Modi, that we need to have North Korea change its policy through the thorough implementation of the newly adopted Security Council resolution by the worldwide community'.
In a spokesman's statement issued on Wednesday, the Korea Asia-Pacific Peace Committee said Japan "zealously joined in the US racket for sanctions", according to North Korea's state media. "Let's reduce the United States mainland into ashes and darkness", it said.
Japan sharply criticised and condemned the latest threat by the North saying that it is only further likely to spike tensions in the Korean peninsula. "Japan is no longer needed to exist near us", the committee said in a statement carried by the North's official KCNA news agency.
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However, South Korea's Unification Ministry was said to still be considering providing $8 million worth of humanitarian aid to its Northern neighbour via organisations organizations such as UNICEF, according to Yonhap News, marking the first time in two years that Seoul had provided such assistance to Pyongyang.
It said Tokyo should never be forgiven for not offering a honest apology for its "never-to-be-condoned crimes against our people" in an apparent reference to Japan's wartime aggression.
Shortly after, Japan's Chief Cabinet Secretary Yoshihide Suga denounced Pyongyang's comments as "extremely provocative".
Japanese Prime Minister Shinzo Abe, visiting India, called for strict enforcement of the United Nations resolution, saying the world must force a change.
While the latest sanctions are not as tough as what the USA had sought, they are expected to have a significant impact.
The US pushed a proposal to strengthen the already-existent United Nations sanctions on North Korea.