So if Japan has a security pact with the United States, why does it need counterstrike capabilities?

那么，如果日本与美国签订了安全条约，为什么还需要具备反击能力呢？

Second, is they're acquiring some capabilities, like counterstrike, and a change in strategic thinking.

其次，他们正在获得一些能力，例如反击，以及战略思维的改变。

Under his leadership, Japan plans to boost its defense spending to 2% of its GDP by 2027, and purchase weapons, including U.S. made Tomahawk cruise missiles acquiring counterstrike capabilities for the first time in decades.

在他的领导下，日本计划到 2027 年将国防开支提高到国内生产总值的 2%，并将购买武器，其中包括几十年来首次具备反击能力的美制战斧巡航导弹。