When you wrote "the 3 large countries", I must confess my first thought was "why, what has India done?": While Russia has a large land area, and are a potential threat if they were to take over Ukraine, until recently the EU's limited financing of Ukraine has been the geopolitical equivalent of loose change found behind the sofa, and that only really changed with the deal that kinda-is-kinda-isn't giving Ukraine the frozen Russian assets.
The differential outcomes for Iran (no nukes) vs North Korea (nukes), then the Russian attempt on Ukraine with nuclear sabre-rattling, and now Trump's plans on Greenland, have all made it increasingly desirable for nations to join the nuclear weapons club.
For specific weapons:
I believe Rheinmetall is currently on target to make more shells than the USA by 2027: https://www.thedefensenews.com/news-details/Germanys-Rheinme...
The differential outcomes for Iran (no nukes) vs North Korea (nukes), then the Russian attempt on Ukraine with nuclear sabre-rattling, and now Trump's plans on Greenland, have all made it increasingly desirable for nations to join the nuclear weapons club.