There is a proof which uses quantum invariants. Since these invariants are typically defined using state-sums and are combinatorial in nature, I suppose that they work in the PL setting. A nice introduction is Justin Roberts' PhD thesis where Rohlin's theorem is proved as Corollary 5.14 at page 55.

Existing proofs of Rokhlin's theorem for PL manifolds
From what I understand, citizens of Hong kong (i.e. holders or HK Special Administrative Region passports) do not require a visa to go to Russia for short trips less than 14 days, according to this page. Does it make a difference if that person currently lives in another country, such as Canada, citizens of which - do require a visa to go to Russia? The same person is also holding a Canadian passport.

Does current residency play a role in this matter at all, if the person tries to enter Russia as a Hong Kong citizen?
