North Korea's response to US sanctions

The United states has decided to increase sanctions on the most controversial government of North Korea. The response of NK to US are stated below:

• 30 November 2016: UN sanctions targeted North Korea's valuable coal trade with China, slashing exports by about 60% under a new sales cap. Exports of copper, nickel, silver, zinc and the sale of statues were also banned
• What happened next? On 14 May 2017, North Korea tested what it said was a "newly developed ballistic rocket" capable of carrying a large nuclear warhead
• 2 June 2017: UN imposed a travel ban and asset freeze on four entities and 14 officials, including the head of North Korea's overseas spying operations
• What happened next? On 4 July, North Korea claimed it had carried out its first successful test of an intercontinental ballistic missile (ICBM)
• 6 August 2017: UN banned North Korean exports of coal, ore and other raw materials and limited investments in the country, costing Pyongyang an estimated $1bn - about a third of its export economy
• What happened next? On 3 September, North Korea said it had tested a hydrogen bomb that could be miniaturised and loaded on a long-range missile.