Czechs and Slovaks, close neighbours and co-habitants in Czechoslovakia during the short 20th century, relied on the Slavic idea in the 19th century. The more the national movements matured, the more the Slavic Idea receded into the background, without being fully given up. The fixation on Russia as a pillar of support, and later on the Soviet Union as "liberator," overlapped with the Slavic idea. That was one of the reasons why it faded in the second half of the 20th century to a faint myth.