The more serious issue, though, is that we don’t know how effective stealth technology will be against a high-tech opponent. An F-35 stealth fighter that gets in a short-range duel with a Flanker-E will be in big trouble—but how good a chance does the faster, more-maneuverable Russian fighter have of detecting that F-35 and getting close to it in the first place?

As the U.S. Air Force would have it, stealth fighters will be able to unleash a hail of missiles up to one hundred miles away without the enemy having any way to return fire until they close to a (short) distance, where visual and IR scanning come into play. Proponents of the Russian fighter argue that it will be able to rely upon ground-based low-bandwidth radars, and on-board IRST sensors and PESA radar, to detect stealth planes. Keep in mind, however, that the former two technologies are imprecise and can’t be used to target weapons in most cases.

Both parties obviously have huge economic and political incentives to advance their claims. While it is worthwhile examining the technical merits of these schools of thought in detail, the question will likely only be resolved by testing under combat conditions. Furthermore, other factors such as supporting assets, mission profile, pilot training and numbers play a large a role in determining the outcomes of aerial engagements.

The Su-35 may be the best jet-age dogfighter ever made and a capable missile delivery platform—but whether that will suffice for an air-superiority fighter in the era of stealth technology remains to be seen.

Sébastien Roblin holds a Master’s Degree in Conflict Resolution from Georgetown University and served as a university instructor for the Peace Corps in China. He has also worked in education, editing, and refugee resettlement in France and the United States. He currently writes on security and military history for War Is Boring.

This article originally ran in 2016.

Image: Reuters.