Kinda wrong. The US and Russia have had a Mutual Legal Assistance Treaty since 2002 and the US and China have a similar agreement dating back to 2001.
Just recently, the US and China had repatriated fugitives to each other, despite having no extradition treaty. No extradition treaty does not mean transferring suspects is impossible.
Just recently, the US and China had repatriated fugitives to each other, despite having no extradition treaty. No extradition treaty does not mean transferring suspects is impossible.