How long do you think it would take for Russia to make certain they do have nukes?
Right now in this conflict they do not have nukes, or at least as far as we know. Russia may be helping them to build their nukes which will still take some time, but they will not sell them one if that's what you mean. If they are going to buy one they'll buy it from NK and right now all eyes are on NK so I don't see that happening either, at least not now.
These are dangerous times we live in.