I would not put to much stock into it. Estonia and Lituania are both Nato countries. Russia would not invade it as that would be going into a straight up war with the rest of the world. WW3 would not happen, Russia would be massacred. China won't help them, they have been eyeing Russian border territories for decades. And the economic sanctions have actually started to hit Russian economy hard, especially since Russia made counter sanctions that only proved detrimental to Russia itself. They are nowhere near as powerfull as Soviet once were, they would not risk any sort of war with NATO. Russia waving the nuclear dick around is desperation. The stuff they have been doing has backfired against them in the longrun and they know it.