New York’s Skadden, Arps, Slate, Meagher & Flom L.L.P. is representing its longtime client Champion International Corp. in its acquisition by Finland’s UPM-Kymmene Corp. UPM has retained New York’s White & Case L.L.P. The value of the stock-for-stock transaction is estimated at about $6 billion; the deal will create the world’s third-largest paper company.

The White & Case attorneys representing the Helsinki-based UPM are partners Timothy B. Goodell, Maureen S. Brundage, M. Elaine Johnston, John T. Lillis, Kenneth A. Raskin and, in the firm’s Helsinki, Finland, office, Tetri Haussila; and associates Robert J. Dobson, Andrea G. Berkley, Uriel Barak, Mark Hamilton, Christian R. Thomas and, in Helsinki, Sven E. Krogius.