True, I don't think Romania would have joined Barbarossa just to get Bessarabia, but they were promissed of Crimea and especially odessa. The Romanians were essentially motivated by greed. I remember reading that when the Romanian retreated from Odessa in 1944 they absolutely took whatever they could , including the seats from the local theatre. When Hitler tried the same strategy with the Serbs by promissing Thessalonika if they attacked Greece, the Serbs told him to go to hell.

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