An apartment in a Moscow suburb damaged by a Ukrainian drone on Friday morning. Olesya Kurpyayeva/AFP/Getty Images

Improvise and innovate have become the watchwords for both the Russian and Ukrainian militaries as they try to outwit each other on the ground, at sea and in the air.

Several recent developments illustrate this constant evolution of tactics and weaponry: a new Russian jet-powered bomb, the Ukrainian use of light planes as long-range ‘suicide bombs,’ and a fresh generation of maritime drones.

Both countries are exploiting AI, robotics and unmanned systems at a high tempo.

But some innovations are remarkably low-tech.

As night fell on one Ukrainian airfield earlier this month, a small group of men assembled a pilot-less light plane for a 2,000-kilometer (1,243-mile) m

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