The United States has completed a study of new weapons needed to destroy hypersonic gliders and directed energy lasers, Greaves said at a think tank.
"The [Missile Defense] Agency and the Department [of Defense] have completed an analysis of alternatives, looking at hypersonic defense of which fast interceptors are… one option, directed energy is another and there are some other options in there", Greaves said on Friday.
During the analysis, private industry was also consulted to assess whether the current suite of interceptors is fast enough to "win the tail chase" to hit a hypersonic target, Greaves added.
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Offensive hypersonic weapons are typically unpowered gliders that fall to Earth at speeds of up to 20,000 miles per hour in erratic, knuckleball-like trajectories. As a result, the weapons are difficult to track with accuracy, let alone destroy with existing missile defenses.
US President Donald Trump unveiled the new US Missile Defense Review in a ceremony at the Pentagon in January. The new strategy calls for pursuing space-based inceptors and deploying more systems in Europe and the Middle East. In particular, the document points out Russia’s hypersonic glide vehicles (HGV) that can maneuver and travel at speeds of Mach 5 in or above the atmosphere.
The document also highlights that Russia’s SSC-8 cruise missile presents a potential major threat to US military operations and deterrence goals. Moreover, the document said China is also developing advanced technologies such as re-entry vehicles and HGVs that pose a potential nuclear threat to US forces abroad and to US allies and partners in the Indo-Pacific region.
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The Russian Foreign Ministry said last week that the document demonstrates that Washington has real plans to use space for military operations and warns that US implementing its new space strategy would affect the system of providing security for space activities.
Russian President Vladimir Putin in an interview with Serbian newspapers published in January reiterated that Russia is not interested in an arms race but will not close its eyes to US cruise missile deployment in Europe.