Ukraine without ECtHR judge

Through Antoine from the ECHR blog I just learned that Ukraine does not have a judge at the European Court of Human Rights (belonging to the Council of Europe which I covered earlier this week) these days:

"A procedural battle is being waged about the appointment of a new Ukranian Judge at the Court. [...]

The origin was the fact that in 2007 one of the three candidates on the list submitted to Ukraine withdrew. Thusfar, the authorities refused to submit a new third candidate. Instead they have submitted a completely new list, without even justifying such a move with a reference to exceptional circumstances. [...]"

How can it take two years to resolve such an issue when the ECtHR is chronically understaffed and could need every judge it can get...?