Checking for Multicollinearity in FE-Model

Hello,

if I use my pooled regression I just use the variance inflation factor.(VIF) to check for multicollinearity.
1) But how can I check for it, if I use the fixed effects model?

2) Can you also tell me if I can always reduce multicollinearity when introducing an interaction term (for two variables which depends on each other) or is it possible that this integration increases multicollinearity?
3) Is it still possible to use the VIF to check for multicollinearity in the pooled regression if an interaction term is included??

I would be grateful to get a response.

Thanks, Lisa