these are barbara mussa, our political correspondent, thomas sparrow, told me why ukraine is now allowing germany's president to visit it wasn't no one's interest. it was neither in ukraine's interest, nor in germany's interest, to have this high profile diplomatic route at a time where so much is at stake. and here in germany, certainly pressure was growing for the german president, but also the german chancellor to try and resolve this diplomatic route. so probably that is the background that explains why the german president was a german head of state frank. by that time i a spoke on the phone to mr. lansky to try precisely and resolve all those differences and then paved the way to a possible visit to key if so, certainly the idea behind all this is to really make sure that those diplomatic difficulties in the past in the last few weeks could certainly be resolved and both ukraine and germany can then move forward. so it's more about the background of this diplomatic spat between german and the ukrainian leadership. where did it come from? how did it develop? what essentially refers t