In recent months, the United States Navy has been working at a fever pitch to find ways to bridge the operational gap between the anti-ship missiles fielded by near-peer competitors like China and the fuel ranges of America’s carrier-based aircraft. The effort has included adding supplementary fuel tanks to the fuselage of Super Hornets, developing procedures to “hot load” F-35s in field expedient, grass air strips inside enemy controlled territory, and the rapidly progressing MQ-25 drone refueler program.

The intent behind all of these efforts is simple: increase the range of America’s aircraft to exceed that of common anti-ship missile platforms, so the Navy’s fleet of Nimitz and Ford class carriers are not rendered useless in a potential conflict.

China, however, may already be working on a way to offset any progress the Navy might be making. New images have surfaced on Chinese social media, and they seem to show a People’s Liberation Air Force’s Xian H-6 bomber converted to carry one specific weapon: China’s formidable DF-21D anti-ship ballistic missile.

The DF-21D is among the platforms American defense officials are the most concerned about. Although little is known about the operational capabilities the DF-21D offers, the information we are able to glean is disconcerting.

A medium-range ballistic missile, the DF-21D was designed to house conventional (non-nuclear) munitions and be fired from mobile, ground-based launchers, and like other conventional ballistic missiles of its type, it follows an arcing trajectory that takes it into the earth’s atmosphere before closing in on its target at hypersonic velocities. There are a number of elements of the DF-21D’s design, however, that make it particularly difficult to intercept, even if you believe in the infallibility touted by the United States regarding their missile defense apparatus (though there is very little evidence to support that bravado).

In particular, the reentry vehicle on the DF-21D possesses the ability to maneuver dynamically to avoid intercept as it closes with its target at an extremely steep descent angle. It’s also, at least theoretically, capable of targeting large vessels in the vast expanses of the open sea. As large as an aircraft carrier may seem when you’re alongside one, even “4.5 acres of sovereign American territory” amounts to a pinhole of a target in the massive Pacific.

In effect, this missile creates an inaccessible area that extends approximately 900 miles from Chinese shores — at least 400 miles further than a carrier could launch aircraft from to engage Chinese targets.

The limiting factor of the DF-21D is really its targeting apparatus. It is assumed that the missile uses radar and potentially infrared to locate its target, but it would undoubtedly need support from external targeting assets like land based radar, manned or unmanned aircraft, and other ships in the vicinity. However, because the platform first became operational in 2010, it can be assumed that China has developed the capability to manage this network to a large extent, though it is currently believed that the missile itself has still yet to be tested on a target in the open sea.