The officials, speaking on condition of anonymity, said South Korea and Japan have asked China to take care so as to ensure that such exports, which Beijing has denied, do not occur.
On Wednesday, Japanese government officials said records obtained from a foreign cargo ship indicate that vehicles apparently capable of launching missiles were shipped from China to North Korea last August.
South Korea and Japan have both raised concerns with China over suspected exports of missile launchers from that country to North Korea, South Korean officials said Thursday.















