Having been in service since 1947 with over 50 state and non-state actors, the T-54/55 is the most widely produced and used tank in the world. Naturally
Slovenia M-55S: Join the war in Ukraine
Is Russia really using outdated weapons like T-62M/T-55M tanks with older rounds like 3BM6? It's also claimed that they are using T-55/54 though that seems quite silly. - Quora
M-55S: Slovenian Wrath - Ground - War Thunder — official forum
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Destruction of Ukrainian M-55 tank captured for the first time
Wade Peters, Author at Tank Historia
Russia Sent 70-Year-old T-55 Tanks To Ukraine Without Even
Russia pulls mothballed Cold War-era tanks out of deep storage as
Slovenia hands over M-55S tanks to Ukraine: what they are
Russia's T-14 Armata - A super tank or lost investment?
Russia's T-14 Armata - A super tank or lost investment?
Tanks of the Ukrainian Army - Wikipedia
Big Serge ☦️🇺🇸🇷🇺 on X: Possibly the worst tank in the world. / X
Answering The Call: Heavy Weaponry Supplied To Ukraine - Oryx