What is needed to ensure long-term peace in Ukraine and Europe against Russian aggression?

According to General Sir Richard Shirreff, long-term peace requires a strong NATO deterrent presence from the Baltic to the Black Sea, including Ukraine as a NATO member. This strategy demands that every NATO nation, America included, commit to supporting Ukrainians in defeating Russia. Shirreff emphasizes that only through unified deterrence can Europe counter Russia's imperial ambitions, as diplomacy alone won't work with a 'revanchist Russia determined to rebuild another Russian empire.' He dismisses the notion that deal-making alone, as suggested by former President Trump, would be effective against Russian aggression.