No one really talks about PM's business in China anymore.
It is because there is nothing really to say, and doubtful there ever will be. Yes, PM inked a minor deal with the Chinese National Tobacco Company (CNTC) over a decade ago, which allowed a minor amount of PM sales in China, largely in duty free stores, in exchange for selling some CNTC brands in places like eastern Europe. Subsequently, BAT and Imperial have inked similar deals as well. None of those deals allows any meaningful access to the Chinese market.
CNTC is government run, and the government is highly unlikely to ever allow meaningful foreign cigarette competition in their country. It provides massive tax revenue to the government, massive employment to their citizens, and likely massive patronage and skimming opportunities for well-connected Chinese.
China easily can (and has) kept competitors out, irregardless of trade agreements, by using public health concerns as the reason. And no politician in the US or elsewhere is going to argue for fair trade deals for "big tobacco".
Below is a link for a very good 2014 article on the CNTC by Bloomberg explaining the size and scope of the company. Note the amount of tax government collections generated by them - 7% of all government revenues. Note how they have essentially copied Marlboro with their #1 brand - Red Pagoda Mountain. Note the 20 million Chinese who get income from cigarette sales. Then you can see why China is unlikely to ever become a more open market. A high tech reduced risk device like IQOS is probably the best try to get into the market, but the Chinese likely won't even allow that in to compete with their monopoly, and instead can copy/steal the technology and idea for the CNTC.