As Russia pounded Ukraine in the opening days of its invasion, the defenders credited a new piece of equipment with helping them fight back — the Bayraktar TB2 drone. Videos shared by the Ukrainian military showed at least one strike appearing to tear apart a column of Russian tanks and armored vehicles. One came from Malyn in the Zhytomyr region, about 150 kilometers from Ukraine's capital, Kyiv, and shows the destruction of a Russian Buk surface-to-air missile launcher, the Ukrainian military said. "Bayraktars at work," the caption for the same video posted on an official military Facebook page said. "Be...