In this task you will be given a claim and a perspective. You should determine whether that perspective supports or undermines the claim. If the perspective could possibly convince someone with different view, it is supporting, otherwise it is undermining.
Q: claim: It is crucial to support the development of a missile defence system.
perspective: As a matter of principle, every country, including the United States, has the right to defend itself to the best of its technological and economic ability
A:
support