JD went to Hungary to endorse and campaign for Orbán and it caused him to drop in the polls substantially in the last few days of the run. Orbán then lost his re-election and the opposition party also gained a supermajority in their parliament, ending a 16-year pro-Russia dictatorship.

Viktor Orban was a serious problem for the EU, since many of its functions require unanimous consent, and he could block anything Putin wanted him to. And apparently he was funneling government money into American right-wing PACs, so his loss is a significant blow to both Russia and the Republican party. It might be dominoes from here.

https://www.bbc.com/news/articles/c8dll93j7d5o

Vance campaigned with Viktor for two days. Viktor then lost the election bad.