Ukraine has destroyed three of Russia’s irreplaceable A-50U airborne early warning aircraft since January 2024. Now Moscow has quietly delivered a replacement. An image published by the Fighter-Bomber Telegram channel on 31 May shows a freshly painted A-50U being handed over to the Russian Aerospace Forces. The caption: “Another upgraded and modernized A-50U has been handed over to the military.” The delivery is a small but significant milestone. The A-50U is Russia’s only operational airborne radar platform — the equivalent of NATO’s E-3 Sentry — and the losses inflicted by Ukraine’s Patriot ambushes and FPV drone strikes have left a gaping hole in Russian air surveillance over the front lines.

Three Down, One Back

The first A-50U was shot down over the Sea of Azov on 14 January 2024, almost certainly by a Patriot battery in a carefully planned “SAMbush.” A second fell on 23 February 2024 in the same region using the same tactic. The third was destroyed on 1 June 2025 when Ukrainian FPV drones struck the aircraft during Operation Spiderweb — a coordinated drone attack on Russian airfields. Each loss was a strategic blow. The A-50U’s Vega-M radar can track 150 targets simultaneously at ranges up to 595 kilometres and vector up to 12 fighters onto targets. Without it, Russian air operations over southern and eastern Ukraine become significantly less coordinated. Defence Express estimates that Russia can keep no more than four A-50Us simultaneously airborne — and that was before the third was destroyed.

The Production Problem

Russia received eight upgraded A-50Us in total before the war. The upgrade programme — converting Cold War-era A-50s to the “U” standard with digital avionics and the improved Vega-M radar — is slow and expensive. Each conversion takes years. The intended replacement, the A-100 Premier, features an AESA radar capable of tracking 300 targets at 643 kilometres, but it is not yet in series production. The new delivery, while welcome for Moscow, does not solve the fundamental problem: Russia is losing these aircraft faster than it can build or upgrade them. The bort number on the newly delivered aircraft was blurred in the Telegram image, and its registration is not visible — suggesting the Russian military does not want Ukraine to track its remaining fleet. Sources: The Aviationist, Defence Express, Fighter-Bomber Telegram channel, Militarnyi