My photographs are proof of what happened. When I go to Russia, sometimes I meet ex-soldiers… They say, ‘We came to liberate you….’ I say: ‘Listen, I think it was quite different. I saw people being killed.’ They say: ‘No. We never… no shooting. No. No.’ So I can show them my Prague 1968 photographs and say, ‘Listen, these are my pictures. I was there.’ And they have to believe me.