Musk's exposure in China is a political risk issue not a finance issue. Musk made deals with the Chinese in order to gain access to their market and to bring manufacturing to China to take advantage of cheap Chinese labor. But China knows that if they toss Tesla without a legitimate reason based on the deal that Musk entered into, China will get a bad rap in the political risk world and will sink any chances for similar deals with Western companies. Every time a Western company makes a major investment in China, they hire a big law firm to prepare a political risk report. If China screws Tesla, every political risk report thereafter will have that at the top of the report. China is still a country that is way behind the West when it comes to innovation and relies on Western companies to bring tech, manufacturing, etc. to China.
The Saudi's interest in Tesla is large enough that Musk has to pick up the phone if they call. But Musk is the controlling shareholder and can do whatever he wants. His real dumb move was using leverage instead of just throwing all cash. He now has a $1 bil a year debt service with a company that is going to be losing a lot of money.
Tesla stock has taken a beating, but Musk is still worth $192 billion even though he lost about $100 bil this year on Tesla's stock dropping from over $300 to just under $200. And he is still the richest man in the world by a good margin.
If he was smart (and he is not), he would sell the motor vehicle division of Tesla to a legacy manufacturer before Tesla falls apart. That would be a huge boost for Tesla because they would have access to franchised dealers and would be able to get their manufacturing in ship shape. Musk would then have a massive pile of cash that he could use to go ruin Twitter and build robots that can dance worse than Musk can.