Unlike the HSR in other countries, the HSR link the cities within the same country like in China, Japan, Taiwan, Europe etc when one can move and work "freely" between cities.
This one is between 2 countries where one cannot work in the other country freely, so its a marked difference.
If you had read some of the interview excerpts, His Royal Highness always seems to refer the Federal people as "outsiders" or "other people" and are extremely bothersome so it shows a somewhat frosty relationship.
Then if indeed the Forest City is aiming to be developed into an IR, then it may not proceed as smoothly as some people wanted.
Yes, SG and MY are diff countries.
My take is that SG is short of people / land and KL/MY folks are 'better' than other nationalities as we are more similar. SG would welcome them as we have not much choice if we were to compete well with other metropolis. MY wants to grow their economy also to be a developed nation . Short cut is to tap on SG growth since I don't think they can grow fast on their own...so it's a mutual win, win kind of relationship. How else would LHL and Najib be talking about HSR and RTS quite so often?