Russia and Ukraine flashpoint

[SecondWar]

https://www.theguardian.com/world/2023/jun/07/nato-members-may-send-troops-to-ukraine-warns-former-alliance-chief

To be clear, it isn't suggested Nato would send troops but some members countries may individually send troops.

There could very other concerns though that if their forces are deployed in Ukraine how would they defend against an inevitable Russian response against themselves?