https://www.youtube.com/watch?v=BuX5xug9prk
Just over 2 minutes. The source isn't given (as per many mediocre youtubes) but according to the translation the date was 1967. Unusual in I think trying to show an air blast - there's a symmetrical blob, including the something like the 'liquid' special effect remarked on by 'NukeLies' in his video. It looks as though the thing explodes while still in clear sight; how can anyone take that seriously? Then there are several 'explosions', starting with the napalm style thing, and a dark smoky thing, finally a white pillar with irregularities - this looks like a still picture, maybe a painting, very like some French images. It appears to be static - I haven't checked carefully, but the zooming out may be designed to hide its lack of movement.
I wonder whether the Cold War with China was another set of lies.