In 1979, Chelomey affirmed that the Buran project was too big, heavy, and expensive for Russia to complete, and designed the "LKS", another space shuttle concept, as an alternative to the Buran or Energia. The first concept had two V-type vertical stabilizers, similar to the &lt;a href="F/A-18"&gt;F/A-18&lt;/a&gt; vertical stabilizer arrangement. This was later changed to the conventional arrangement of a rudder, similar to the Space Shuttle and Buran.