Dong Dang: Soldiers were deployed to a railway station in the Vietnamese border city of Dong Dang on Monday ahead of the expected arrival of North Korean leader Kim Jong Un.
Kim is expected to pass through en route to the capital, Hanoi, for his second summit with US President Donald Trump.
It is unclear if Kim will disembark in Dong Dang and take a car to Hanoi or if his train will travel all way to the capital.
A heavy military presence was seen outside Dong Dang station, as well as nearby roads and bridges, on Monday morning.
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Trump and Kim's first meeting, in Singapore in June, produced a vaguely worded commitment from North Korea to dismantle its nuclear weapons programme.
Heading into this week's summit, Trump has said that North Korea has not tested any nuclear weapons in months and that as long as that testing has ceased, he's in no rush.