(New throughout, adds Russia, China comment, background)
UNITED NATIONS, Aug 5 (Reuters) - The United Nations Security Council unanimously imposed new sanctions on North Korea on Saturday that could slash by a third the Asian state's $3 billion annual export revenue over Pyongyang's two July intercontinental ballistic missile tests.
The U.S.-drafted resolution bans North Korean exports of coal, iron, iron ore, lead, lead ore and seafood. It also prohibits countries from increasing the current numbers of North Korean laborers working abroad, bans new joint ventures with North Korea and any new investment in current joint ventures.
"We should not fool ourselves into thinking we have solved the problem. Not even close. The North Korean threat has not left us, it is rapidly growing more dangerous," U.S. Ambassador to the United Nations Nikki Haley told the council.
"Further action is required. The United States is taking and will continue to take prudent defensive measures to protect ourselves and our allies," she said, adding that Washington would continue annual joint military exercises with South Korea.
North Korea has accused the United States and South Korea of escalating tensions by conducting military drills.
North Korean ally China and Russia both slammed the U.S. deployment of the THAAD anti-missile defense system in South Korea. China called for a halt to the deployment and for any equipment already in place to be dismantled.
"The deployment of the THAAD system will not bring a solution to the issue of (North Korea's) nuclear testing and missile launches," China's U.N. Ambassador Liu Jieyi told the Security Council after the vote.
RUSSIA HOPES U.S. SINCERE
Liu also urged North Korea to "cease taking actions that might further escalate tensions."
Russia's U.N. Ambassador Vassily Nebenzia said sanctions should be used as a tool for engaging Pyongyang in talks and that creative new approaches were needed to address the issue.
He said he hoped recent remarks by U.S. Secretary of State Rex Tillerson "were sincere - that the U.S. is not seeking to dismantle the existing (North Korea) situation or to forcibly unite the peninsula or to militarily intervene in the country."
While the Security Council has been divided on how to deal with other international crises like Syria, the 15-member body has remained relatively united on North Korea. Still, negotiating new measures typically takes months, not weeks.
The resolution adds nine individuals and four entities to the U.N. blacklist, including North Korea's primary foreign exchange bank, subjecting them to a global asset freeze and travel ban.
North Korea has been under U.N. sanctions since 2006 over its ballistic missile and nuclear programs and the Security Council has now ratcheted up the measures in response to five nuclear weapons tests and four long-range missile launches.
The United States negotiated with China for a month on the latest resolution, before expanding negotiations to the full 15-member council on Friday.
U.S. FRUSTRATION WITH CHINA
U.S. President Donald Trump's administration has been frustrated that China has not done more to rein in North Korea. Washington has threatened to exert trade pressure on Beijing and impose sanctions on Chinese firms doing business with Pyongyang.
Haley on Saturday thanked China for its "important contributions" to the resolution.
"These sanctions will cut deep and in doing so will give the North Korea leadership a taste of the deprivation they have chosen to inflict on the North Korean people," Haley said.
In November the Security Council capped North Korean coal exports at $400 million annually, though China - its largest buyer - halted imports in February. The resolution adopted on Saturday completely bans North Korean exports of coal.
A U.N. diplomat said North Korea had been expected to earn an estimated $251 million from iron and iron ore in 2017, $113 million from lead and lead ore and $295 million from seafood. The diplomat said it was difficult to estimate how much North Korea was earning from sending workers abroad.
A United Nations human rights investigator said in 2015 that North Korea has forced more than 50,000 people to work abroad, mainly in Russia and China, earning between $1.2 billion and $2.3 billion a year for the country's government. (Reporting by Michelle Nichols; Editing by David Gregorio)