It's not for trying to destroy US foreign policy, although Mr. Assange's day in court on those charges may yet come. Rather, it appears Mr. Assange can't take "no" for an answer when it comes to his sexual hijinks. From CNN:

WikiLeaks founder Julian Assange was arrested Tuesday on a Swedish warrant, London's Metropolitan Police said.

Assange turned himself in at a London police station at 9:30 a.m. and will appear at the City of Westminster Magistrate's Court at 2 p.m., police said.

Swedish authorities had issued the warrant for Assange so they can talk to him about sex-crime allegations unrelated to WikiLeaks' recent disclosure of secret U.S. documents.

Assange has not been charged.

At court, Assange will be able to respond to the arrest warrant, and the court will then have roughly 21 days to decide whether to extradite him, said Mark Ellis, executive director of the International Bar Association.

[...]

Sweden first issued the arrest warrant for Assange in November, saying he is suspected of one count of rape, two counts of sexual molestation and one count of unlawful coercion -- or illegal use of force -- allegedly committed in August.

The Australian High Commission in London said Tuesday it was providing consular assistance to Assange as they "would to any Australian under arrest."

Let's hope Mr. Assange is extradited and thrown in the slammer. It seems unlikely that anyone is going to arrest him for any other crime.