Every day victims of DV try to recant or drop the charges. They can't. Only the DA can.

This simple Q&A forum is simply not adequate for what you need. You need your own attorney.

Imagine being in a foreign country, and having that country find out you have a warrant. Imagine spending a few weeks in a foreign jail while they...

Yes, you can still be charged. Will you? No idea.

Hopefully, you are not doing this pro se. But yes, your lawyer can make a motion.

The question of whether you will be able to "reopen" your case will be decided by a judge if you make a proper motion. Proving duress is very...

No it is not............................................................

It is probably an out of country scammer. Just block them. If you know this person you can file for a restraining order.

They are not required to accept your statement that they have the wrong person, so you have to defend the lawsuit.

There is a common scam in which this happens. Without paperwork, no way to know if it is legit, but it doesn't sound like it.