U.S. President Donald Trump dismissed a Chinese diplomatic effort to rein in North Korea's weapons program as a failure on Thursday, while Secretary of State Rex Tillerson said Beijing was doing a lot, but could do more to limit oil supplies to Pyongyang.
In a tweet, Trump delivered another insulting barb against North Korean leader Kim Jong Un, who he called "Little Rocket Man" and a "sick puppy" after North Korea test-fired its most advanced missile to date on Wednesday.
Russian Foreign Minister Sergey Lavrov said Washington's approach was dangerously provocative.
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