Warsaw (AFP) – US President Joe Biden on Saturday castigated Vladimir Putin over the month-old war in Ukraine, bluntly calling the Russian leader “a butcher” who “cannot remain in power”. In an impassioned speech from the Royal Castle in Warsaw, delivered after meeting top Ukrainian ministers in Poland and earlier conferring with NATO and EU allies on the conflict, Biden plainly warned Russia: “Don’t even think about moving on one single inch of NATO territory.” Although the White House moved quickly to temper Biden’s unprecedented comments on Putin — insisting the US leader is not seeking “r…