Taiwan and west taiwan.

Those that are culturally close to each other.

Poland and Hungary have historically been very close allies since the middle ages, lots of shared culture, history, they've faced similar struggles over the years, and generally they've always held each other in pretty high regard. They each even have a little poem about how much they like each other

Them polish version translates to something like

Pole and Hungarian brothers be,
good for fight and good for party.
Both are valiant, both are lively,
Upon them may God's blessings be.

The Hungarian Version

Pole and Hungarian — two good friends,
fighting, and drinking at the end.

Unfortunately there's been a lot of tension between them in recent years over the war in Ukraine, and their relationship has been deteriorating.

All of them.

sweden and somalia

Swaziland and Switzerland

Countries are countries, not people, and cannot really be friends. Countries, today, are all nation-states and therefore inextricable from the global caoitalist system, so to be free of politics would be to end every country. In this context, countries can be allies, usually due to shared interests to meet strategic goals.

Inversely, countries are enemies due to their inherent political nature, the global unstable system of exploitation. To imagine an end to inter-country hostility is to imagine the end of capitalism and nation-states themselves. Under such events the people who live in what is now Chile could love those in Saudi Arabia as much as those in Tanzania.