According to witnesses, police divide those at the gym into citizens and non-citizens. Russians are taken to enlistment offices, where their military records are checked.
Non-citizens are accused of immigration violations and given a choice: deportation, or enlistment in the army, according to Current Time, an independent Russian news platform.
Cuba btw refuses to cash the cheques the US sends them. In my head canon Fidel used each and every one going over his desk as a cigar lighter.
Fun fact: It can be argued that the German Democratic Republic still lives on in the form of an Island gifted to them by Cuba. The island was not mentioned in the German unification treaty so the GDR still has territory, but Cuba argues that it was just a symbolic act, not actual gift, and the German foreign ministry concurs. But what about the foreign ministry of the GDR? They should at least be heard on this matter.