The content originally appeared on: CNN Washington (CNN)It might be a cyberattack targeting Ukraine's energy grid. Or the movement of Russian battalions and tanks along the border and into firing range. Or perhaps even a long-range missile attack. They're all potential signs US and European officials are closely monitoring that could reveal President Vladimir Putin is moving forward with an invasion of Ukraine. With more than 100,000 Russian troops amassed along the Ukrainian border - a number that continues to […]
