The Guardian's Moscow correspondent, Shaun Walker, and The Telegraph's Roland Oliphant tweeted today that a column of armored personnel carriers (ACPs) and other Russian military vehicles have crossed over the Ukrainian border. Vladimir Putin's government is sending a convoy of unmarked white trucks to Ukraine, and military vehicles started traveling alongside a supposed Russian aid convoy earlier on Thursday. Most of the fleet of more than 262 vehicles, including about 200 trucks carrying aid, stopped 15 miles from the border of Ukraine's rebel-held eastern region of Luhansk. If these reports are correct, a separate military convoy has apparently continued into...