This is a very deep and complex historical question that causes many disputes. The simplified answer in the style of "Bulgarians are ungrateful" is not only incorrect but also hinders understanding the logic of international relations. The situation where Bulgaria found itself in the camp of the opponents of Russia in both world wars was the result of a tragic convergence of geopolitical interests, not the consequence of any innate ingratitude.

To understand this, it is necessary to analyze Bulgaria's motivations separately for each war.

Why did Bulgaria join World War I on the side of Germany and Austria-Hungary?

The key reason was the Machiavellian principle of "the enemy of my enemy is my friend" and unfulfilled national interests.

1. Geopolitical ambitions and "national unification". After being freed from the Ottoman yoke in 1878 (due to Russia), Bulgaria had the dream of uniting all lands with an ethnic Bulgarian population into one state (Great Bulgaria). The main enemy, holding these territories, was not Germany, but neighboring countries:

   • Serbia held Macedonia (in the opinion of Bulgarians).

   • Greece also claimed part of Macedonia.

   • Romania held Southern Dobruja.

2. The Second Balkan War (1913) — the root of the problem. This key event predetermined Bulgaria's choice in WWI. Dissatisfied with the division of the spoils after the First Balkan War, Bulgaria attacked its former allies — Serbia and Greece. The result was catastrophic: Bulgaria lost a large part of the conquered territories and even had to cede Southern Dobruja to Romania. Russia, the traditional patron of all Slavic peoples, tried to maintain neutrality in this conflict, but ultimately did not support Bulgaria because it could not afford to lose an ally in the form of Serbia.

3. The choice of side in WWI. By 1915, when Bulgaria was deciding which side to join, it faced a choice:

   • The Entente (Russia, France, Britain): offered to return only part of Macedonia but required Bulgaria to cede it to Serbia — its key ally on the Balkans.

   • The Central Powers (Germany, Austria-Hungary): offered all of Macedonia (taking it from Serbia) and all of Southern Dobruja (taking it from Romania).

For Tsar Ferdinand I and the government, this choice was obvious. They went with those who promised to realize their main national goal. Thus, Bulgaria fought not against Russia as such, but against Serbia for its interests, and Russia ended up on the other side of the barricades as an ally of Serbia.

Why did Bulgaria join World War II on the side of Germany?

The logic here was different, but still based on cold calculation and survival.

1. Geopolitical pressure and lack of choice (1941).  By March 1941, Germany had already dominated Europe. Its troops were stationed in Romania and preparing to invade Greece. Bulgaria was surrounded by countries of the "Axis" and the USSR, with whom Germany had a pact at the time. Refusing to join the "Axis" threatened immediate occupation, as it happened with Yugoslavia and Greece. Tsar Boris III chose the path of least resistance to preserve sovereignty and avoid war.

2. Territorial acquisitions without war.  By joining the "Axis", Bulgaria gained significant territories without military action:

   • Southern Dobruja was returned from Romania (with Germany's consent).

   • Unique phenomenon: "Axis ally, not fighting with the USSR". This is a critically important point. Despite pressure from Hitler, Tsar Boris III and the Bulgarian government never declared war on the Soviet Union and did not send their troops to the Eastern Front. Formal diplomatic relations between Bulgaria and the USSR were maintained until 1944. This was a subtle diplomatic maneuver demonstrating that for the Bulgarian elite and people, war with Russia/ the USSR was absolutely unacceptable. Bulgaria fulfilled its ally obligations to Germany mainly on the Balkans (occupation of territories), but not against the USSR.

Conclusion

The assertion that Bulgaria "always fought against the Russians" is a strong oversimplification.

• In World War I, Bulgaria fought for its national interests against Serbia, and Russia, as an ally of Serbia, automatically became its opponent. The decision was pragmatic, although painful from the perspective of historical memory.

• In World War II, Bulgaria became a satellite of Germany under pressure from circumstances, but did everything possible to avoid direct military conflict with the USSR, demonstrating deep respect and special relations based on historical memory of liberation.

Thus, Bulgarian policy in the 20th century was determined not by "ingratitude", but by a tragic choice between geopolitical reality, national interests, and historical sympathies, in which pragmatism often took precedence over sentiments.

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