If you haven't done it yet, make the Russian salad.
Drain the tuna well and mix it with the Russian salad (if it is whole fillet fillets, chop it up first).
Add the mayonnaise and mix again.
Cut the bread into slices and lightly toast it in a non-stick pan on both sides.
Stuff each piece of bread with a little Russian tuna salad, then decorate with a slice of olive.
The canapes with tuna Russian salad are ready, you just have to serve them.
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