More background to the war in Ukraine:
As Putin ramped up his attacks on Ukraine, Russia sought to starve the Ukrainian (and Georgian) army of armaments, blowing up arms depots in Bulgaria and Czechia:
www.washingtonpost.com/…
‘“From the evidence thus gathered so far, it can be concluded with a high degree of reliability that the purpose of the actions of the Russian citizens was to cut off the supply of special products to Georgia and Ukraine,” the Bulgarian prosecutor said in a statement.’
Note that Bellingcat tracked GRU operatives from the same unit, 29155, responsible for the poisoning of Sergei Skripal in England.