Not posting this as a definitive gotcha, but this article includes some detail on how the situation was "complex" at best
> In early 1994, after the Trilateral Agreement, "General Vitaly Radetskyi, Ukraine’s new Minister of Defence, summoned Mikhtyuk and two of his senior generals to Kyiv.[10] Without warning, General Radetskyi told them they had 15 minutes to decide whether to take Ukraine’s oath of allegiance. General Mikhtyuk and one general took the oath, while the other refused. Then, the minister ordered [Mikhtyuk] to return to his headquarters in Vinnytsia immediately, and convene all of his subordinate commanders. ..He did so explaining his personal decision to remain in Ukraine, and asking each officer to take or reject the oath. “All of my deputies,” Mikhtyuk recalled, “except one, said they would not take the oath and asked me to transfer them to the Russian Federation."