This seems to be the work of Russian electronic warfare, rather than Iskanders. It could also be S-400 decoys.

The explosions were from Geran-2 drones and air defence activity

Some channels are writing that Ukrainian drones attacked the Iskander-M launchers as they were about to launch missiles.

Drone alerts were issued for approximately the area where the Iskanders are launched from.

Russian Geran-2 drones are attacking targets in Kharkiv City, Bohodukhiv (Kharkiv Oblast), and Putvyl (Sumy Oblast).

Explosions in Buryn, Sumy Oblast. Russian Geran-2 drone attack.

Explosions in Zaporizhzhia City. Another Geran-2 drone attack.

Repeated Iskander-M threat from Bryansk

Explosions in Kyiv. Large Geran-2 drone attack.

This Iskander threat is related to Russian S-300 air defence activity against Ukrainian drones over Bryansk Oblast

More Geran-3 jet-drones are flying towards Kyiv

Iskander-M threat from Lisky/Novovoronezh, Voronezh Oblast

3 Tu-160M strategic bombers carried out launch maneuvers of Kh-101 cruise missiles, likely from Vologda Oblast.

We will know if these launches were real or simulated in the next 90 minutes.

Up to 7 Tu-95MS strategic bombers will likely carry out launch maneuvers of Kh-101 cruise missiles in the next 30 minutes.

As of now, communications are being recorded on 3 different combat-related strategic frequencies: 4330 CW kHz, 4632 CW kHz, and 4638 CW kHz.

Was going to post this earlier, but forgot.

3-4 Tu-95MS strategic bombers carried out launch maneuvers from near Engels, Saratov Oblast.

Explosions near Chernihiv City. Geran-2 drone attack.

Explosion in Zaporizhzhia City. Geran-2 drone attack.

Explosions in Korotych, Kharkiv Oblast. Geran-2 drone attack.

Explosions in Apostolove, Dnipropetrovsk Oblast. Geran-2 drone attack.

Iskander-M/Zircon threat from Kursk Oblast