Actual tl:dr:

https://en.wikipedia.org/wiki/Romanian_Treasure#The_Treasure_since_1917

Very little is known about the Treasure after the October Revolution, but it appears that during World War II all the valuables held by the Soviet state (and presumably of the Romanian state) were taken out from Moscow and sent toward the regions which were 'not endangered'. However, it is clear that they were not kept sealed, as the agreement with the Romanian government said, as the chests of the archives which were returned in 1935 had obviously been rummaged through and many objects and documents were missing.

And from that, you get a title of "nation of thieves"?