Orban, being the contrarian that he is, finds friends in those that seek to undermine european and western unity. Russia, China and Trump fall into that category. Ukraine is forced to host Orban, because he is the biggest roadblock amongst Ukrainian allies for more aid. And Hungary has taken over the presidenc, of the council of the European Union, which rotates every six months.
As for why Orban is president of Hungary: Corruption and propaganda. Orban controls the big media institutions and has all other press harassed. He has control over the judiciary and a wide net of sympathisers both within and without the government. He is as clise to being a dictator as the EU will let him and he keeps testing the waters to strengthen his control further.
A large hungarian voter base is as loyal to him as MAGAites are to Trump.