The Nebo-M[1] or Nebo-ME (in Cyrillic: 55Ж6МЕ «Небо-МЕ», Nebo means "sky") also known as RLM-ME or 55Zh6ME (export version)[2] is an integrated multi-functional radar system that features a multiple programmable multi-band design radars and a central data fusion.

System design was initiated on a mobile chassis in 1999, after NATO countries intervened in the Federal Republic of Yugoslavia, in which the stealth F-117[4] participated - one was shot down by S-125 Neva with help of P-18 radar - Russia started to perceive stealth aircraft as a possible future threat to their security.

From the beginning, Nebo-M represented a modification and modernization of older VHF band Nebo SVU, L-band Protivnik G, and S/X-band Gamma S1 radars on mobile chassis.

[25][26] Other sources report deliveries of Nebo-M and Nebo-UM radars already in 2015 to Eastern military district.

[28] In August 2023, a Nebo-M operated by the Russian Aerospace Forces' 3rd Radio Engineering Regiment on the Tarkhankut Peninsula in western Crimea, near Olenivka village, were the target of a Ukrainian boat raid.

On October 3, 2024 Ukrainian forces claimed to have destroyed a Nebo-M radar using an ATACMS missile; the location of the attack was not specified.