Russia is preparing an "asymmetric" response to the increase in NATO troop rotation in Eastern Europe, and in particular the United States' military presence near Russian borders, Russia's ambassador to NATO said on March 31. "Of course, our response will be completely asymmetrical. It will be calibrated to match our ideas about the degree of military threat, to be most efficient and not overly expensive," Alexandr Grushko said on Rossiya-24 television. "We can see that the U.S. continues to increase its military presence in Europe with an emphasis on the Eastern front... We are not passive observers. We consistently implement...