Night of the Hawk by Dale Brown

Night of the Hawk - David Luger who saved the crew of the Old Dog in Russia by sacrificing his life is now being controled by an ex-KGB officer.  Because of his knowledge, Luge was brainwashed into thinking he is a Russian and as a scientist in Vilnius Lithuania, Luger has helped the new Commonwealth of Independent States develop a megafortress like bomber, the Fisikous-170 Tuman.  When operatives of the US learn that Luger is in Vilnius helping, they label him a traitor, but General Brad Elliott has also learned of Luger's survival and the Old Dog crew volunteers to help extract their savior.  While they plan to rescue their friend, Byelorussia plans to invade Lithuania.