Now, do you want to send everyone off straight away or would you like to get some Armour and Guns first?
What, if anything, will the U.N. provide? I'd want to leech off that as much as possible, since someone decided an unmanned frigate would be a better use of our funds.
We'll say we have until day four to purchase stuff and get it shipped to Germany, so unless I'm mistaken we have $2000 to play with for getting our initial wave of peacekeepers equipped...
Assuming that the U.N. provides nothing, first priority is going to be body armor for everyone. That's $900, and gives us 200 spare suits. With the $1100 that that leaves, we can only purchase 2200 AK's. I don't like the idea of sending out militia off unarmed, so:
a) If the U.N. will provide armor, weapons, or peacekeeping positions that don't require weapons (engineering, on-base things, etc.), take as many of those as possible. If our militia already has weapons, let them use those. Priority for the money remains armor > weapons, equipping as many troops as possible.
b) If there are cheaper weapons about to be purchased, go for those. Yes, the AK/74 is a better weapon than (say) the AK-47, but they are still both capable weapons, and I'm not entirely sure if our militia is well-enough trained for it to make much difference. The weapon will be new and unfamiliar to them anyway
c) Send as many troops as we can give an automatic rifle (plus the body armor we're giving them) to the UN, rather than all 7000. That gives us between 2200 and (potentially) 7000 troops, still well more than enough to properly equip the next mission
d) Any militia left over will be using the $400/day of taxation income towards training. I know right now we're at $100/3 days, but we've got until day 11 before we can do anything which (it's day 2 right now, right?) gives us three cycles of hopefully-increasing size as the new regulars help the elites train. Assuming that we spend a total of $700 on that training (in batches of 300/600/1200 as we go from 30 + 0 to 30 + 300 + 30 + 900 trainers), at day 11 we'll have 2,100 regulars and $2200, whereupon the UN will pay us at least $220,000 and we can look into getting some serious hardware.
From that:
1) How much would it cost to hire outside trainers, probably either from the US or Russia, and how would that affect our training rates? The faster we can train our militia into some kind of reasonably disciplined army the better.
2) What does the "serious hardware" price list look like? At this point, I'm most interested in anti-tank ordinance, anti-air and anti-ship missiles, rockets (particularly the mobile multiple-rocket launch systems, like surplus/retired Katushas), and the higher end of infantry weapons/armor/equipment. We aren't going to be able to match Ukraine man-for-man (Seriously, they've got a 700,000 man standing army, a significant fleet in the black sea, a ton of leftover Russian planes, and nukes), so I'm looking at well-trained and well equipped troops, high-value asset destruction, and area denial capability as a way to make at least some progress against them.
3) How much does it cost to build factories, license weapons (and other things) for production, start thinking about research labs, etc.?
Edit: And what does our civilian population look like, in terms of ability to staff factories/labs/etc?