Stoltenberg is first Nato Sect General that has visited Saudi Arabia and from the wording of tweet he understand what Saudi expects but its another matter to what extent he understand. US is now key provider to Airbus and that Airbus what is expected in Gulf emirates. there many other things but Aviation that i follow. This is the titanium for A350 which highly Saudi going to order if B787 not soon enough.Stoltenberg's childish tantrums are best ignored. Everyone knows he's just an American stooge and lobbyist with little actual power.
The China-Europe relationship is complicated. Europe's intel agencies and militaries (which are closely integrated within Nato i.e. US intel/military structure) want a tougher stance on China while the business community want cooperation with China. Europe is still trying to find the appropriate balance between those two forces, but the status quo benefits China because the balance of economic/tech/military power shifts in China's favor every year. So China will continue trying to pursue good relationship with Europe.
If any things that goes wrong in the above arrangement than the bill on Colonization will goes against Europe and than at that time Europe will need US. MBS basically created a modern Saudi state and that state will be creating New Europe.