The RSUs would be considered income from a California source so California would expect you to pay taxes on the sale. So you will need to report that income to California. Since there is no other California income that is the only amount that California will tax you on.
I have no idea whether you need to report that income to Singapore or what Singaporean tax laws there are. But if you do pay taxes on it in Singapore you will take a credit for the taxes paid there on your federal return.
@sneha1512
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