Will Ukraine and Russia fight?

No, because no one dares to do it. To put it bluntly is a threat. At present, Russia's actions are also very limited, that is, around Crimea, where the naval base is located, Russia has always occupied the vast majority and it is very easy to control. Ukrainian targets in Crimea were also surrounded and surrendered. There is no military attack, and it will not attack other parts of Ukraine, otherwise it will be a total war.