Why did Japan suspend the Aegis Ashore missile defence system?

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Japan Suspends Aegis Ashore Deployment Due to Cost and Changed Premises

Japan has suspended the deployment of the Aegis Ashore missile defence system, a decision announced by Defence Minister Taro Kono and supported by Prime Minister Shinzo Abe. The suspension stems from significant cost and time constraints, coupled with a shift in the foundational assurances provided to local residents regarding the system's placement. The government is now exploring alternative measures to ensure the nation's defence capabilities remain robust.
Unforeseen Hardware Upgrade Costs

The decision to halt the Aegis Ashore deployment was primarily driven by the ministry's conclusion that ensuring the system's interceptor missile gear would not land in residential areas would necessitate a costly and time-consuming hardware upgrade. This technical requirement fundamentally altered the feasibility of the original plan, making the initial assurances given to local communities untenable.
Shifting Premises for Local Communities

Prime Minister Abe articulated that the suspension was a direct consequence of the changed premises upon which the system's deployment was initially explained to local populations. The inability to uphold the original guarantee regarding the system's non-impact on residential areas rendered further progression of the current plan impossible, leading to the decision to suspend.
Commitment to Alternative Defence Measures

Despite the suspension of the Aegis Ashore system, the Japanese government has affirmed its commitment to maintaining the country's defence capabilities. Discussions are underway to explore and implement necessary alternative measures, ensuring there is no gap in national defence following this decision.
Original Rationale and Evolving Concerns

The Aegis Ashore system, with its radar purchase approved in 2017, was initially intended to bolster Japan's defensive posture against North Korean missile launches and to strengthen ties with Washington. However, concerns from residents in potential deployment regions about the interceptor's proximity to residential areas and the risk of becoming targets in a conflict, alongside conflicting reports on escalating costs beyond initial US$4.2 billion estimates, contributed to the programme's controversial nature and eventual suspension.

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Why did Japan suspend the Aegis Ashore missile defence system?

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