Nikkei Index Arbitrage

Is it true that Nikkei Futures can be arbitraged between SGX and Osaka?
Any prop firm in Singapore/ USA/ Australia doing it ?

Have you been reading about Nick Leeson or smth?

I had read about him in the past but I think that was related to not just trying to tarde teh futures
I believe in order to stop losses from Nikkei Straddles ( Sell Call and PUt option) he bought and sold Futures on Nikkei
He was not purely trying to arbitrage
Any way reason I am inquiring is I heard that it is still possible but you need good tools etc
and people are doing it in Singapore
So trying to find if it is really do

What correlation exist between SGX and Nikkei? I am not sure there is much?

The co relation I am talking about is is about SGX listed Nikkei futures and Osaka listed NIkkei futures both on sam eindex and both in Yen
Not the SGX singapore index

The difference between them is the sgx listed ones have a 5 point spread compared to 10.