This is an international advice request.

I haven't seen my Japanese ex in over a year, but she recently stalked my online location while I was in Japan (she saw group photos posted on a public Facebook page and knew my next social event, so she lied to police that I was beating her and told them to arrest me).

I was stopped by police while at a social event in Japan, and they questioned me for around 20 minutes. The ex basically told police I was threatening to kill her, post her nudes online, that I had beat her, raped her (I haven't even seen this person in a year!) etc etc. The police were very respectful, and I denied any wrongdoing despite the huge language barrier. They had me sign a statement that I was not posting her nudes and that I was not contacting, beating, or raping her. (I wrote the statement myself, so it's not like I signed something in Japanese I couldn't read.) The male police officer seemed to believe my facts and details. I recently got another gf and this only enraged my ex more.

I left Japan shortly after and am now back in the US. But she still remains hellbent on misusing police resources, and intimidating me with police. She sends death threats via email, says she'll SWAT me and get my 2A (gun) rights taken away etc etc. She's said she'll tell the police I'm an active shooter etc. or that I have a bomb just to land me in a police-show-up-guns-drawn incident. She is batshit insane...

So now, me being back in the US, and wanting absolutely NOTHING to do with her, how do I protect myself? My crazy ex is playing the whole "my boyfriend beats me narrative" and constantly fakes injuries, sends herself email death threats, and has blatantly lied to Japanese police.

This whole across international borders thing is also a huge headache. It's not as simple as getting a restraining order. Because I don't even know if I can get one for a non US citizen or have it applied internationally.

• Should I let me local police know of this? That she's threatened to SWAT me? I don't exactly want local police to know I'm a 2A enthusiast especially since I do cherish my 2A rights and it is a major hobby for me.
  
• What do I say or do to protect myself in case she fabricates more stuff?
  
• California does have some kind of domestic violence clause for revoking 2A rights and this crazy ex has thought of some crazy ways to inconvenience me. Sometimes I think she's even crazy enough to quit her job, fly here, and claim rape in person..