However , North Korea accelerated their missile and nuclear tests leading to increased tension .
During the campaign and the early months of his presidency , Trump said he hoped that China would help to rein in North Korea 's nuclear ambitions and missile tests .
North Korea accelerated their missile and nuclear tests leading to increased tension .
During the campaign and the early months of his presidency , Trump said he hoped that China would help to rein in North Korea 's nuclear ambitions and missile tests .