Russia is very unlikely to join, but who knows what the EU might do to get them, or what kinds of negotiations could happen. Or where they might direct their attention instead. Israel isn't much less part of Europe than Turkey is (only a tiny portion of Turkey, where Istanbul is, is actually in Europe - the rest is in the middle east), and Israel is part of many European competitions already. There is a lot of talk about them joining. The main point of the EU originally was to make Europe peaceful, and it's worked thus far. I can't see why it couldn't work with Israel, too. Israel could benefit from joining the EU, and the EU would say, you can join if you quit fighting with Palestine and behave yourselves.
Russia will not join. Look at their response to the Magnitsky Act. They like being corrupt, and will not get rid of their corruption to meet EU standards. And how can Israel join the EUROPEAN Union? That would be wrong, and likely fatal to the EU's cred with Muslims.