2 years after #Russia’s #invasion of #Ukraine, countries such as the #Baltic states & #Finland warn that a threat to their own territory may be just over the horizon, w/some #intelligence agencies saying the #Kremlin could make such an attempt w/in a decade. Now they are taking lessons from their enemy’s robust defense lines in Ukraine, noting that Russia’s system of #minefields, #ConcertinaWire & #trenches made it all but impossible for Kyiv’s forces to advance last summer.