1. Assange is not violating any Swedish laws or policies by staying in the embassy and avoiding extradition, he has no obligation to return to Sweden and every right not to.
2. Assanges presence in Sweden is not required by Swedish policies or laws, Swedish courts already called out the prosecutor for not accepting his statements from the embassy.
The duty of the prosecutor also seems to need clarifying, some people here seem to think that the prosecutor has no obligation to agree to interview Assange in the embassy. This is absolutely not true.
Do you not think that the victims(although not entirely applicable here) are OK with the prosecutor indefinitely delaying the case until the crimes expire just because she is too arrogant to pick up the phone and ring up Assange or buy a 30 euro plane ticket to London?
Another thing worth noting is that many people seem to think UK is a particularly easy country to extradite people from, this isn't exactly true. See Gary McKinnon and Lauri Love.
Sweden has a history of just handing people over to the CIA.