He was eventually cremated, except for a portion of his skull, which is still in Moscow.
His ashes and those of Eva, his wife, were spread over a small bridge of a small river years after the fall of the USSR.
So he cannot “spin” in any grave.
As I recall from recent History Channel investigative documentary, DNA analysis showed that those chunks of skull in Moscow weren't his (via comparison to his relatives), or even of a male. His remains are probably in Brazil or Paraguay.