A Soviet Army monument in the Bulgarian capital of Sofia has had a subversive makeover in an anonymous commemoration of the Warsaw Pact invasion of Czechoslovakia, which crushed the Prague Spring uprising 45 years ago. The bronze relief sculpture was painted a flamboyant pink in the early hours of Wednesday morning, and covered with the captions: "Bulgaria Apologizes" and "Prague '68." This isn't the first time the monument has been given a new paint job -- in 2011, unknown artists turned the soldiers into American pop culture icons including Captain America and Ronald McDonald. The monument is a permanent source of contention in Bulgaria, which, in 1990, became the last country to apologize for the 1968 military intervention.