German media Die Welt has published an investigation into the critically important military aid provided by Bulgaria of all countries, that helped Ukraine fight off the russian invasion forces during the first months of the all-out war.
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As the journalists found out, in the initial six months into the war, it was Bulgaria who provided 30% of the totality of ammunition and 40% of fuel that came from allied countries, while the Ukrainian army needed these supplies the most, Politico reports.
The transit of Bulgarian resources into Ukraine was carried out through Romanian territory and the Polish city of Rzeszów. Officially, the supplies came from the countries of the West, the total value of the goods amounted to EUR 2 billion.
Investigators noted that such large-scale assistance to Ukraine from Bulgaria was possible only due to the political will of the now-ex-Prime Minister Kiril Petkov. Because at that time, 70% of the Bulgarian population did not support helping Ukraine so as to avoid being dragged into the war, too.

At the same time, the former defense minister of Bulgaria was saying there was no war in Ukraine at all on the 4th day of the russian invasion, echoing the Kremlin's narrative, which is why he lost his position.
The supplies themselves included newly made ammo and rounds manufactured at Bulgarian defense industry facilities. From outside, it looked like Western private companies were just buying new ammunition from their Bulgarian colleagues and transferring them by trucks and transport aircraft to Poland, while the official Sofia pretended not seeing this.
For that reason it looked like the Bulgarian government was giving no military aid for Ukraine. The deliveries started coming in April 2022, after Ukrainian foreign minister Kuleba's visit to Bulgaria.

The same April 2022, Bulgaria started delivering diesel fuel for armored vehicles as well. Paradoxically, the fuel was made by "Lukoil" plant in Bulgaria that was spared from Moscow's operational control but still had all the working supply chains.
Petkov said to Die Welt journalists that "Lukoil's" management and personnel condemned the russian invasion of Ukraine, so it was just a matter of "asking" the company to help with "redundant" product to the Armed Forces of Ukraine.
That is why Bulgaria asked for the EU Commission an exemption from the oil embargo imposed on russia – to keep supplying the AFU with fuel, Die Welt states.

In fact, Bulgaria had all the motives to keep the real scale of aid for Ukraine in secret: russia was constantly trying to shut Bulgarian critical infrastructure down with cyberattacks. Now and then the russians succeeded, and the Bulgarians had problems with pension payments as long as all the financial systems were down. Or experienced power supply issues, as the energy systems were the target for the russian cyberattacks, too.
On the part of Defense Express, we should note that open domain had quite enough evidence that Bulgaria was providing military assistance for the Ukrainian army, although without admitting it officially. In this context, we can recall the Bulgarian anti-tank rounds for the MT-12 "Rapira" or even the T-72 tanks repaired by Bulgarian Apolo Engineering for the Armed Forces of Ukraine; or how the Ukrainian soldiers destroyed the invaders with 82mm mortar shells of Bulgarian origin.

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