A plane ticket. Others have suggested he’s bored and I concur. IMO, he needs to be intellectually challenged while simultaneously having his fears assuaged. Fear, I believe, is a key driver in pushing people toward fascist ideologies. Most likely he fears not being loved.

Traveling to countries with very different cultures can be both stimulating and reassuring, especially if it involves some significant challenge - a physical one like climbing a significant peak or somewhere that’s just super hard to get to. You can demonstrate that you love and care for him by going with him. Just the two of you.