ASML

That's not just a challenge to Beijing, but also asks tough questions of allies - and presents Washington with a dilemma over how far it's willing to squeeze them to comply.

The most important tech company you've never heard of

Top tech companies turn to a Dutch firm for ultra-advanced machines to make chips. The machines use light beams to make narrow circuits on chips - which are now the backbone of the world economy

ASML said the agreement began in 2018 and was slated to expire at the end of 2020, but the two companies agreed in February to extend the deal to the end of this year

ASML could be cousin to ARM in next tech wave