Look at the map above. Much of the mostly-Russian speaking area is in rebellion. Lugansk and Donetsk Oblasts are at the far right. Those along with Kharkiv and Zaporozhye Oblasts, also have significant populations that not only speak Russian but are actually ethnically Russian. Lugansk and Donetsk are in open revolt, and in the past week, guerrilla actions have spread to Kharkiv, where sabotage has been going on for some time. Just now guerrilla activities are being reported in Zaporozhye, the furthest to the south and west of the four yellow-brown striped regions. Between Zaporozhye and Crimea, which is mostly in brown is Kherson Oblast, where guerrilla activities have also begun this week.
To the far southwest is Transcarpathia, in red stripes with green on the border. The red stripes are Rusyns, who have gotten sick and tired of this new Ukrainian ethnostate. I also understand that there is a lot of unrest by Hungarians in Transcarpathia (in green). Slovaks in that state (not shown, but presumably next to Slovakia to the northwest of Transcarpathia, are also quite unhappy.
Although the region declared its independence around the same time that Donetsk and Lugansk did, about half of the regions in Transcarpathia are now in open armed rebellion. Checkpoints have been set up all over these rebellious regions and gunmen guard them, only letting people they know come through. Today, Ukrainian troops have been ordered into Transcarpathia to deal with the armed revolt there. What will happen? Will there be another region embroiled in civil war as in the east?
You can see that Odessa is also majority Russian-speaking. This of course is the scene of the Nazi massacre of a large number of unarmed pro-federalist protestors in the Labor Ministry of the capital city. Conceivably, armed actions could also spread to Odessa. There are also Romanians, Moldovans and Bulgarians in this part of the Ukraine. There was a recent video out of the Romanian part of Bukovina (the area in red in the southwest with grey creeping up into the red). They were very unhappy about their sons being drafted to fight in the East. Many were burning their family draft call-up papers.
However, guerrilla activities have not yet spread to Odessa and Bukovina.
To the west of Odessa is a region called Transdniestria, on the far east of Moldova. The Russian majority here has been in armed rebellion since 1991 when they ceded away from Moldova. There is a significant Russian force there, and the region has its own significant militia along with quite a bit of military hardware. There are calls by the same idiots who started this mess for Moldova to go in with its military and reconquer this rebellious area.