Okay, sure.
Let me mention that the biggest problem is that Ukraine needs security guarantees. Also the problem of recognizing Crimea is that this is a threat to the international rules-based order.
What I want to say really briefly is that the reality that Europe and North America are faced with right now after this Russian aggression is that a new iron curtain will be descending in Europe. After this war, Russia's neighbours and any states that were part of historic Russia will not feel secure from Russian attack.
The EU and NATO members have the structures through which to think about how to deal with this hostile Russia in the future. The non-EU NATO members in the neighbourhood will have to figure out how to avoid being sucked into Russia's sphere of influence or worse.