Of course, China has many options to prevent Nancy Pelosi from visiting Taiwan. One option is signing official mutual defense treaty with Russia. Another option is supplying drones and missiles to Russia. Either option will prevent Nancy Pelosi from visiting Taiwan. China has the cards to play. America does not have any card to play other than order Taiwan to secede from China.
recognizing Luhansk and Donetsk with a state visit by Wang Yi to Donbass. They should know that if NATO supports separatism in China, China can support separatism in and around NATO.
It is unlikely that China will intervene in the war in Ukraine.It is beneficial for China not to express their attitude, although the Ukrainian attitude is "if you don't help me, you are helping Russia".
However, there have been rumors that China will provide J-10 fighters to DPRK according to the tension of the surrounding situation.DPRK don't mind China helping them improve new missiles.
The formal military alliance between China and Russia should be the last resort for EU countries to resolutely adopt a hostile attitude.
Pelosi can be a little bolder,the risk of her special plane being shot down basically does not exist.This gamble can win her a great reputation,there may be a grand "welcome ceremony" waiting for her, but she can return in time. Or summon up the courage to ignore any warnings and break through the blockade of bravado.
If nothing happens by then, then someone runs the risk of being a second Khrushchev.