4 trends tracked about this subject — the full history, oldest to newest below.
Russia has reportedly revived a Cold War-era 'Dead Hand' nuclear system within a rebuilt secret bunker in the Urals to ensure retaliatory strikes.
Ukraine carries out drone strikes targeting major oil refineries and a military airfield deep inside Russian territory.
Recent Ukrainian strikes target multiple Russian oil refineries and regions, shutting facilities and causing casualties.
Russia's FSB states it thwarted an extensive drone attack plan directed by Ukrainian intelligence against multiple strategic domestic targets.