In 1987, a key topic was the removal of medium-range nuclear missiles from Europe, as had been agreed in the INF Treaty. Tensions rose with the USSR after Mathias Rust`s landing in Red Square, but eased again with the July visit of West German President von Weizsäcker. General Secretary Honecker`s trip to West Germany, the Klaus Barbie trial in Lyon, and the Kurt Waldheim debate also preoccupied diplomats and politicians.