@Casey_03 the more I think about it & I surely believe you must be as that baby, grows & changes your life forever, but at the same time, worrying you about his next strike.
I worry too, that this rat bag you obviously had a deep connection to, at some point in the not so distant past... is firing warning shots because that is all he dare do!
You hope to go to Russia & live safely there. Do you have anywhere else, perhaps less obvious than Russia? I know you said you may have a job there but are not 100% sure. Do you have a plan B) should that not work out? Are you allowed to stay in Russia indefinitely without working? Are you entitled to welfare assistance if you do go to Russia with no work?
Do you have friends, family anyone who opposes the bio father... Oh & sorry for using the bio father label, because a real father steps up to the situation & supports in any way he can, not threaten to harm as he has!
Now, not wanting to get off your situation, but I was in a similar situation here in Australia. I realized too late, that I had more power over him than he led me to believe. So, though my son is now now grown up. He is deserving of any inheritance should his father meet his maker. So I plan when I can, to lob a few grenades into his life, only from a far distance under the vail of a third party, because I know he has lied his head off to the authorities. For instance he purchased a house whilst claiming to be unemployed. That is not doable even in Australia! & he too was a foreign citizen who in a moment off stupidity on his behalf signed the birth registration papers & then resumed his threats of retaliation just as you are receiving.
So, back to plan B) As suggested keep those threats he made very secure. Also do you have any item's that may contain his DNA, photos of him & you in times in the past. Anything & everything that ties him to you, I sincerely hope you safety store. You may need them one day & before they lose their DNA value, get them tested.
I think about his motive's all the time. I think you have more power than he.
Nobody can be for sure, but I believe any Court in the UK, would decide in favour of the child's welfare, first & foremost as I suggest his threats are designed to make you disappear.
Our court system very much derives from the UK system, we have many laws, known as the Winchester system that remain unchanged since our Country came into it's own independence. Family Law would likely be very much aligned with the English system.
I guess what I am suggesting is a bit more research into his Countries legal precedents may enlighten you to what he may or may not have the power to do. I know there are agencies who do pro bono legal work in the UK system, in international framework & family law. Some of whom would delight in forcing him to compensate you for raising his child, wherever you are.
The proof of burden (a legal term) lays at his feet to justify no child support to his child you are carrying. He must prove that his child is in the hands of an unsafe mother, which you are obviously not. Especially if you are in Russia & have employment & support to care for baby.
I, again believe he has much more to fear you, than the other way around.
I suggest you have a closer look at what & how UK courts have ruled & therefore made precedents they must take into judicial account. You cannot be the first woman in such circumstance.
Knowledge is power
@Casey_03.
His threats to harm you & unborn child may be his biggest mistake ever.
Just a suggestion.