Socialist realist architecture in Yugoslavia came to an abrupt end with Josip Broz Tito's 1948 split with Stalin. In the following years the nation turned increasingly to the West, returning to the modernism that had characterized pre-war Yugoslav architecture. During this era, modernist architecture came to symbolize the nation's break from the USSR (a notion that later diminished with growing acceptability of modernism in the Eastern Bloc). The nation's postwar return to modernism is perhaps best exemplified in Vjenceslav Richter's widely acclaimed 1958 Yugoslavia Pavilion at Expo 58, the open and light nature of which contrasted the much heavier architecture of the Soviet Union.