In my opinion, "Malorossichi" is the best.
Even more so, "Malorossichi" doesn't reflect the desired meaning. This unpleasant name was invented by you, our brothers, the "Velikorossichi," so you could use it to demean and emphasize our subservience. So, no way!
For now, they are weaker, yes. I like to quote Emperor Alexander III: "Russia has no allies except its army and navy." In other words, if it becomes advantageous for them to do us some harm, small or large, they will do it without batting an eye. And even if they are democratic and allies 10 times over, nothing will change.