There is a European arms framework, that is developed to be compatible with NATO and thus US stuff. Nordic fighter jets which have been exported to many countries can carry US missiles. All the while, the US is phasing out the M16/M4 in the USMC for a German licence built rifle. They have been using German small arms for a bunch of stuff for a while.
Also, it’s not NATO who’s saying the Russians want to attack neighbouring states, it’s Russia who is saying that, who has been saying that, who has actually been attacking neighbouring states. Finland and the Baltics have been invaded in the past by the Russians as well, and Putin is open about wanting to reconquer them.