South Korea says it's seized a Hong Kong-registered ship that reportedly transfered oil to a North Korean vessel in October.
On Tuesday, a South Korean paper reported China had been sending oil to North Korea via ship-to-ship trades.
That would put China in violation of a United Nations security resolution from September 2017, which barred that type of oil transfer to North Korea.
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South Korea says it has the ship's crew in custody while the investigation continues. China has denied it violated the resolution.
The captured vessel is 1 of 10 ships the U.S. asked the U.N. to ban from international ports earlier in December.
