Sorry, unless the alien's country of origin agrees to expatriation, the alien's foreign citizenship remains intact. The US cannot revoke foreign citizenship. US law has no force or effect in a foreign country. Similarly, operation of foreign law has no force or effect in the United States.<quoted text>Main article: Oath of Allegiance (United States)
The United States Oath of Allegiance (officially referred to as the "Oath of Allegiance," 8 C.F.R. Part 337 (2008)) is an oath that must be taken by all immigrants who wish to become United States citizens..
I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform :noncombatant service in the Armed Forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely without any mental reservation or purpose of evasion; so help me God.
Play law doesn't count, child.
Silly child, the US government cannot "strip away" the citizenship of any other nation, not even through naturalization in the US. Renunciation of citizenship is between the individual and the foreign government whose citizenship is renounced. If the foreign government does not accept renunciation, then the person naturalized is a dual citizen, i.e., recognized a citizen by both countries.