Plenty of things.
Thank you for the question.
As has already been said, the four countries involved have different relationships with each other. I would say that China plays a predominant role in these relationships, but everyone is still independently involved.
Iran has a much closer relationship with Russia when it comes to material defence co-operation and political support on the nuclear issue, for example. Iran also has a very close trading relationship with China, particularly when it comes to oil.
As has already been mentioned, North Korea has a military relationship with Russia. It is also a very close partner of China.
These are things we are looking at. Perhaps General Ritchie has some examples he could add.
You also asked about India. On that topic, I would just like to say that we have a long-standing relationship that is quite close, based on mutual respect—