What message is Russia trying to send with its attacks on Ukraine's power infrastructure as winter approaches?

Russia appears to be deliberately targeting Ukraine's heat and electricity installations at a critical time when temperatures are plummeting to minus 10 degrees in Kyiv. These strikes, which left approximately 160,000 Odessa residents without heat and electricity, are specifically designed to inflict damage on civilian infrastructure essential for daily operations during harsh winter conditions. The timing of these attacks, occurring shortly after US-Russia talks in Riyadh, suggests Russia is sending a calculated message about its continued aggression regardless of diplomatic engagements, highlighting the vulnerability of Ukrainian civilians as temperatures drop.