Erm, I think Yeltsin's threat as it were to the Ukrainian is actually a diplomatic move, he wants Ukraine to remain within the Soviet Union, er and if it does so he's not going to make an issue of the border, but, er, if it does break away completely I think what he's saying is well there's a frontier that we're going to have to reconsider because large Eastern areas of Ukraine including huge industrial towns are predominantly populated by Russians.