Ok, sorry for the potential double post, but I'm fairly certain someone is going to post before I'm ready anyway.
Edit: 5 new messages! Yeah!
I was posting quickly before going to class, so I couldn't comment on that opinion piece I posted earlier. I think arming Ukraine isn't a good idea, for a number of reasons.
First of all, Ukraine can't win the war. Even with modern weapons, there is no chance of a purely military victory by the UAF. The number of Russians troops in Ukraine is a few thousands. Not counting conscripts, Russia's land forces numbers in the hundred of thousands. Of course, not all of them are deployable, but Russia could still easily increase its deployment tenfold. Increased UAF capabilities will only be met with increased Russian presence, causing more collateral damage but changing little on the ground.
Now, this was a bit of a strawman: the op-ed's author don't claim Ukraine could win the war. What they want to do is to make the war expensive enough for Russia to cause it to quit. Their model is Afghanistan. However, Ukraine is not Afghanistan. The war in Afghanistan succeeded so well in bleeding the USSR because of its asymmetric nature: you could hand over a few 40,000$ Stinger missile to a mujaheddin and he'd down a 10 millions $ Su-25.
Ukraine is not a guerrilla war, but a conventional war where two armies are fighting each others. It's not clear we can get such good return on investment. It would also cost us a bunch, and further destroy Ukraine. Russians should pays for Russia's actions, not Ukrainians.
I think arming Ukraine is also counter-productive. Russia's actions are so dangerous because they broke the taboo on using armed forces to change borders by force. Of course we shouldn't be angelic and refuse to use force in any conditions, but as long as there is a chance to go back to that taboo of violence, we should pursue it. And that means refraining from using armed forces in Ukraine, even arming forces in Ukraine, especially since it wouldn't help much.
Of course, that doesn't mean we should stand by. I agree with the general sentiment that we must make this war expensive for Russia, if not with the methods. But there are still better ways. We haven't exhausted sanctions. We can still do more to limit Russian energy export. We can further restrict Russia's access to international finance (banning them from SWIFT for exemple). We can restrict visas for Russians coming to Europe (Sorry Knit Tie). Generally speaking, I think we can figure plenty of ways to make Russia miserable without further destroying the Donbass.
P.S.
Another thing that makes me reluctant to back arming Ukraine is the Syrian precedent. I simply don't trust Obama on this one. Syria has been 4 years of supporting the rebels just enough to make the war drags on. No vision, just reluctant actions that makes things worse. I don't want Ukraine to go the same way.