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The vice-president said the US did not have immediate plans to expand the American military presence on the ground, but would invest more resources, including naval ships and military icebreakers.

"It's not like I use it as an icebreaker or anything," he says.

The liberal South Korean president, Moon Jae-in had been hoping for an icebreaker with Pyongyang.

Oboronlogistika said the cargo ship, which it described as the flagship of its fleet, was carrying 45-tonne hatch covers for icebreakers, as well as the large cranes for the port in Vladivostok.

Mr Butlin assigned a worker to get guests involved in games with icebreakers and jokes.