The Russian military may be trying to vacate back to Russia just to redeploy elsewhere. They are essentially stranded at the moment and it'sclear Russia needs warm bodies to feed into the grinder. It would be interesting if the Ukies made a go for destroying the Russian garrison to prevent them from being a problem elsewhere as well as curry favor with Moldova but I doubt the world community would condone it unfortunately.
All Moldova needs to do is order them out on near-impossible terms that wind up impossible thanks to Russia being a clusterfuck, and then when they don't meet those terms ask Ukraine to disarm them and escort them out and back to Russia. The chances of the garrison disarming so they can be escorted out by Ukrainians are about 0, so with a bit of PR laundering Moldova and Ukraine look like the good guys.
Here's a thought experiment: If the US deployed all their Europe-based forces, without drawing from anywhere else, how much would it affect the conflict?
On one hand, it's the USA. On the other hand, their presence in Europe is pretty small compared to other theatres, the USS George H W Bush only has F-18s and APS-2 is a fairly small one. Would it merely tilt the scales a bit, or would Russia get utterly fucked?
For starters, the Super Hornet is one of the most advanced planes in existence, entering service in
1999, so its at least as good as anything Russia has, and then you have the Growler variant which trades out the Vulcan for a crapton of ECM for use in the intruder/SEAD role. Plus the
Bush is a Nimitz-class, so you've got
multiple squadrons of multi-role aircraft, plus helicopters that can be used for everything from SAR to medevac to ASW. Now, this is contingent on the Turks letting it through the straits, but since the Roaches and Russians have
never been on good terms that's not impossible.
As to Europe based forces, you've got a bunch of spec ops that have been in the Baltics training those guys on asymmetrical warfare in case Russia did a repeat of 2014 on them, plus we moved most of our guys from Germany to Poland. Add in that there's still probably some pretty hefty support infrastructure (medical and logistics as opposed to munitions) from the Cold War and the overall impact of land forces is surprisingly big, never mind the impact of adding multiple squadrons of Super Hornets to the already tenuous Russian air situation. Won't immediately win the war, not even close, but it would definitely tip the scales in Ukraine's favor.
AGS-17 is inaccurate at long ranges, AGS-30 is too light and therefore unstable. 30mm grenades barely produce any shrapnel and don't have airburst/DP rounds (i.e. the useful ones). Also, I'm not sure Ukrainians have enough grenades for AGS after a year of war.
The Russians have a lot of those problems with too little weight. IIRC they've got a 14.5mm anti-materiel rifle that weighs even less than the M82 the US uses or the PGM the French do and I can't imagine its pleasant to fire since less weight to the gun means more recoil right to your body.