Kyrgyzstan said Friday that three citizens were killed after Uzbek troops opened fire at the disputed frontier of the two Central Asian countries. Border disagreements have dogged the republics formerly controlled by Russia throughout their three-decade independence, with decision-makers referring to different Soviet-era maps to back up their territorial claims. “Without regaining consciousness, they died from their gunshot wounds,” the Kyrgyz national security committee said in a statement, adding that it had taken place on Thursday. It was the most serious incident to occur at Kyrgyzstan and…