Elise Hu

Secretary of State Rex Tillerson's inaugural trip to East Asia was marred by misunderstandings that arguably could have been avoided had Tillerson followed decades-old practice and spoken for himself — to the State Department press corps aboard his plane.

But there was no State Department press corps aboard his plane.

Tillerson had one reporter along — from a conservative-leaning news site who does not cover the State Department. In another break with tradition, the reporter did not offer a pool report to colleagues on the ground.

The effect?

Secretary of State Rex Tillerson has arrived in Tokyo to begin a a six-day sweep through Northeast Asia. It's his first trip there as America's top diplomat, and he heads into a region full of challenges, both old and new.

Malaysian authorities say initial autopsy results show a chemical weapon — VX nerve agent — was used in the fatal poisoning of Kim Jong Nam, older half-brother of North Korea's leader Kim Jong Un.

VX is an odorless substance that can exist as liquid or gas. It can kill within minutes if it's passed through the skin. It is 10 times more toxic than sarin and classified as a weapon of mass destruction.

South Korea's government says it's convinced the North Korean regime orchestrated the bizarre poisoning death of Kim Jong Nam, the estranged half-brother of North Korean leader Kim Jong Un.

"We are observing this pointless and merciless incident with grave concern," the South Korean Unification Ministry said in a statement Sunday.

Updated 11:25 p.m. ET

Malaysian police say they have arrested a second woman in connection with the killing of the North Korean leader's half-brother, Kim Jong Nam. She is 25 years old and a holder of an Indonesian passport. They say she was identified from surveillance TV footage of the airport. Earlier, authorities said they had detained another woman in the death.

It's the stuff of spy novels.

South Korean defense officials and the U.S. Strategic Command say North Korea test-fired a "medium- or intermediate-range" ballistic missile early Sunday morning local time, which flew eastward for about 300 miles from the west coast of North Korea, over the peninsula and landed in the Sea of Japan. This marks the first missile test by the Kim Jong Un regime since October, and the first during the new Donald Trump presidency.

Japanese Prime Minister Shinzo Abe arrives Thursday in Washington for talks on Friday with Donald Trump, an effort by this longtime Asian ally to get a better read on the way forward with the unpredictable new U.S. president.

President Donald Trump's "America First" pronouncements will frame the first major international trip of his administration this week, as Defense Secretary James Mattis visits South Korea and Japan.

Trump's disruptive approach to foreign policy may challenge an already shaky government in Seoul, Mattis' first stop.

What makes North Korea feel so oppressive? If you ask its highest-ranking defector in decades, the answer is censorship. Thae Yong Ho, who was until last summer a Pyongyang envoy in London, argues that increasing the flow of information into the North is what can sow the seeds of popular discord to bring down the Kim Jong Un regime.

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