Moderator's Warning: Friendly reminder to everyone to discuss the topic only please and leave the personal comments directed at other members aside. Thanks.
Why do we fall?
So we can learn to pick ourselves up.
once again, there aren't any good options. i think that the least bad options are diplomatic and economic until Iran demonstrates that aggression is inevitable.
You have also still failed to explain why they would take the fantastically risky position of equipping Iran with advanced weaponry when they have to date refused to do so, and secondly how they would facilitate the deployment of such systems in a timeline that actually effects an existing campaign. Furthermore you have not addressed China's unwillingness to aggravate its greatest regional energy partners. Why China would intervene to protect a doomed Iran at the cost of losing all of its investments both political and economic with Saudi Arabia, Qatar, the UAE, etc is beyond me and does not match up with reality.
A Sino-Russian savior intervention in Iran is fantasy.
Also what business interests? Russia already lost out on a nearly $13 billion contract with Iran because it refused to supply them with S-300 missile batteries, planes, warships, armored vehicles, etc. They have instituted a defacto arms embargo on the country. While China hasn't sold them significant military equipment in some time and has much more important regional trading partners.
Waiting for Russia's Next Move on Iran - Carnegie Endowment for International Peace
so, to be clear, you believe that China and Russia will allow a preemptive attack on Iran, and will not respond?
i would disagree. they are already responding.
Russia: New US sanctions on Iran 'overt ... JPost - International
China slams new US-Iran sanctions as 'serious violation of intl rules' — RT
exactly how they will respond is certainly up for debate. whether they will respond is decidedly less so.