The word cooperative has two meanings. Originally it means to cooperate, that is: working together. It implies a kind of equality between the parties involved. But the word has acquired another meaning. When the police talks about a suspect being cooperative they simply mean that he does what they want him to do. And when your boss tells you that he wants you to be more cooperative he usually just wants more obedience.
When the Western countries ask Serbia to be more cooperative one would expect them to use the first meaning. However, often their behavior puts them closer to the second meaning of the word.
Take the issue of the mobile telephone transmitters. If such an issue would arise in a Western country the solution would be pragmatic. It would be recognized that - as Serbia is pumping 500 million a year into Kosovo - missed revenue for Kosovo is not the real issue. It would also be recognized that having cheap phone connections to Serbia is essential to many of Kosovo's minorities. So the most probable solution would be to give those Serbian companies some kind of official license. In exchange they would pay some taxes and maybe the involved Serbian companies would ask to offer some service so that the Kosovo companies can offer their customers cheaper phone access to and inside Serbia.
This is a classical win-win solution as experienced leaders all over the world have been designing for centuries. Unfortunately Western Kosovo policy is defined by idealist NGOers and diplomats who never have felt the need to be pragmatic. As a consequence this issue - like many others - has been hijacked by Albanian nationalists and US officials who see imposing Kosovo's independence on the world as matter of American prestige instead of as a problem between Albanians and Serbs.
A similar issue is at work with Kosovo's participation at international conferences. There was a solution and that worked for some time. Then some countries decided to change the formula in the favor of the Kosovo Albanians and when Serbia balked they accused Serbia of not being cooperative. In fact it was of course those changers who were not cooperative.
Another example was the electricity. Several Western countries offer their citizens the choice between more than one electricity provider. So there was no reason why the Serbian company couldn't get a special status in Kosovo. In fact it would be advantageous as it would make that company responsible for the payment by Kosovo Serbs - reducing the risk of non payment for the Kosovo company to zero. Instead it was chosen to have a solution where Kosovo's Serbs were forced to give in. The fact that the deal was sweated with money obscured for many that this set a precedent that was not about cooperating but about imposing the will of one side. This set the precedent for even more ugly behavior in the case of the mobile phones and the minibuses.
The core of Western democracy is respect for different opinions. So for Kosovo the litmus test for its democratic content is how it treats those people who believe that its independence is illegal. Blowing up transmission towers and forbidding minibuses shows that democracy in Kosovo still has some serious shortcomings. This is not a cooperative attitude, this is the opposite: using any excuse to badger dissenting voices. In a cooperative attitude force would only be used when all other options were exhausted and even then not more than strictly necessary and without losing respect.
One of the main misunderstandings is the idea that any issue is a battleground for (or against) the recognition of Kosovo's independence. Yet cooperation can only work once you allow that some subjects should remain neutral territory. The main effect of making everything a battleground is that it delays the finding of solutions.
I have always believed that the unilateral independence for Kosovo was a stupid mistake. It was based on the belief that Serbs are a kind on evil human sub-race that is incapable of compromise. This idea resulted first in the Ahtisaari negotiations were as a matter of "principle" the Serb side was robbed of all its negotiation chips. Next was unilateral independence and it seems that we have now arrived at the third stage where misguided internationals are prepared to commit serious human rights violations in order to realize their goals.
Experience learns that if they get what they want they may very well be setting the stage for the next Balkan drama. The ethnic cleansing during the Kosovo War was a direct copy of the ethnic cleansing of Croatia 14 years before. The international involvement in that cleansing is one of the darkest episodes of Western involvement. Unfortunately too many Westerners are still proud that they then helped to "restore Croatia's territorial integrity". Milosevic used the same excuse.
Look at how countries like Nepal and El Salvador handled their guerrilla problems. Both recognized that the guerrilla's had some point. And instead of just stating that those guerrilla's were outside the law and should be punished they adopted amnesty laws, employed former guerrilla's in the army and gave them other help to get settled. That is the kind of pragmatic attitude that is needed in Kosovo.