It's kind of weird how long the antagonism between Finland and Russia goes back. I think they were fighting all the way back at the beginning of the Romanov Dynasty... well before the Communist period. Must be over ports on the Baltic sea and land between the two.
Also, I didn't realize that cluster bombs go back to the second world war, as this is clearly what this weapon is... Apparently, according to the wikipedia article, the Germans were the first to create a cluster bomb, but clearly, Molotov got there first:
And there is a convention on cluster munitions:
Nasty things, to be sure.