E-mail Dating scams?

What is the best way to detect a dating mail scam? After 8 mails back and forth with this woman from Russia, she was suppose to come to the states for work and traveling in general, now she says she is in Moscow and does not have enough money to finish her trip. She asked for 1000 dollars, and I’m refusing to send it, how can I find out who is behind this obvious scam to report them?

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