Extradition can take a long time - see Julian Assange. He didn't commit a crime on American soil as far as I know, but the US tried very hard to get hold of him

Extradition can take a long time - see Julian Assange. He didn't commit a crime on American soil as far as I know, but the US tried very hard to get hold of him. But set foot on the soil and the arrest warrant would be served.