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We continue watching developments in the search for flight 370 but there's other important news you need to know. two other officials tell cnn russia now may have as many as 40,000 troops at its border with ukraine. karl penhaul is joining us live from the ukrainian side of the border. karl, tell us what's going on. >> well, we're hearing the village and if you look around it's not much more than a collection of a few houses and a few shack. the russian board ser that way, literally just a few hundred yards. we came here already dark and we really don't know what is going on on the other side ...

Don't seem to pay much attention to that border itself. those are four key tribal areas in the reason. much of the board ser dominated by the pushtun tribes and the baluchi tribes. one thing to know about these tribes, they have more -- greater affinity to their own ethnicity then they have to the country in which they live. being a citizen of pakistan is not nearly as important as what tribe you're a member of in that particular region. this is part of the issue. that boundary is called the duran line, the boundary between afghanistan and pakistan. it was drawn in the 1890s by sir henry morti...