The vesting of the RSUs is a taxable event for US tax purposes. The value of the RSUs on the date they vest is considered ordinary income, and is subject to Social Security and Medicare taxes, as well as federal and state income tax. If you paid Japanese tax on the RSUs as well, then you can claim a credit for foreign tax paid. If you don't yet know how much your Japanese tax was/is, you will have to wait to file your US tax return. If you don't know by April 15, you can file an extension.
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