The C4ADS report said a small number of interconnected Chinese firms accounted for the vast proportion of trade with North Korea, leaving the impoverished country's procurement network vulnerable to targeted, enforced sanctions.
United States forces remain near the Korean Peninsula with an "armada" led by the aircraft carrier USS Carl Vinson.
Foreign Affairs Minister Gerry Brownlee said the funding was stopped a year ago because of concerns over North Korea's provocative actions, including two nuclear tests in 2016.
A North Korean drone spied on the site of a USA missile interceptor system in South Korea, military officials here said Tuesday.
Last month, Lieutenant General Vincent Stewart, the US Defence Intelligence Agency chief, said it was "inevitable" that a nuclear weapon launched from North Korea would hit the US mainland. "North Korea is poised to conduct its first ICBM test in 2017".
Moon has sought to expand cross-border civilian exchanges as a way to improve ties, but North Korea on Monday rejected a Seoul civic group's offer to provide anti-malaria supplies to protest South Korea's support of fresh United Nations sanctions adopted last week.
Moon's comments were an apparent reference to the issue of Korean "comfort women", a Japanese euphemism for women forced to work in the Japanese military's wartime brothels.
Mattis, speaking before the panel, warned of the potential losses in the case of conflict with North Korea.
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The drone is similar in size and shape to the drone North Korea sent in March of 2014 to Baengnyeongdo Island on the western sea border which was estimated to have flown some 300 hundred kilometers.
"Since assuming leadership in North Korea, Kim Jong-un averaged 10.8 missile tests per year in the 2012-2016 period".
South Korea's football association said on Tuesday that it wanted to pursue talks with the neighbours about the possibility of hosting the tournament.
"We want to start discussions with China and Japan on this idea", a spokesman for the Korea Football Association (KFA) Cho Jun-Heon said. The two other fishermen, who wanted to return home, were repatriated on Friday.
It has tested three ballistic missiles, a surface-to-air missile and cruise missiles since Moon took power in early May.
Stored on the chip were ten photos of the US missile defense system THAAD stationed some 270 kilometers from the inter-Korean border.
It marked the fifth missile test-fire by Pyongyang since the South's liberal President Moon Jae-in took office in May.