

Each will send their old or excess stock, or newly manufacturer weapons.
Some of the old stock may include weapons bought from the US previously, but it’s very unlikely Europeans will be buying new weapons and supplies from US to give to Ukraine. France, Germany Italy, Spain and the UK all have significant arms manufacturing ability and have ability to scale up quickly. (Reference)
Many European leaders (including business leaders) are extremely reticent to enter into new supply deals of any kind with the US given the recent trade volatility.
Best answer.
Extra tip: You can combine the two last commands with:
systemctl enable --now <unit name>.service