The Prime Minister landed in Kyoto this morning for a three-day visit where she hopes to strengthen ties with Tokyo, paving the way for a new era of trade with Japan and Asia after Brexit.
But after Kim Jong-un launched yet another rocket on Tuesday morning, which flew over Japan, the visit is being overshadowed by the increasing threat from nearby Pyongyang.
As a result, Mrs May will have been briefed on Japan’s j-alert emergency response drill, which instructs citizens to stay indoors and away from widows should a 10 minute missile warning be issued.
Those caught outside and unable to find shelter are told to adopt the “duck and cover” method of lying on the floor and covering their heads.
Motorists are advised to leave their vehicles and cover their nose and mouth if the missile lands nearby.

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That the Prime Minister of Great Britain is being issued with such instructions reflects the extraordinary situation that Asia, and the rest of the world, is currently facing.
North Korea’s missile launch on Tuesday brought to end a period of relative calm, where despot Kim had apparently held off plans to attack th US island territory of Guam to see how America responded.
It had raised hopes that the diplomatic solution being sought by US Secretary of State Rex Tillerson and Defense secretary Jim Mattis might be achievable.
But the latest missile test, described by Mrs May as a “reckless provocation” suggests Pyongyang is hell-bent on starting a new global conflict doomed to end in disaster.
The Prime Minister will discuss the North Korea situation with her Japanese counterpart Shinzo Abe.
“It gives me the opportunity to sit down with Prime Minister Abe over the next few days to discuss the action that North Korea has taken.
“These are illegal tests, we strongly condemn them and we will be working with Japan and other international partners to ensure that pressure is put on North Korea to stop this illegal action