Overshadowed by the war in Ukraine, elections on Sunday in Hungary and Serbia appear to have extended the tenures of Europe’s two most Kremlin-friendly leaders, both populist strongmen fortified by their overwhelming control of the media and cheap energy from Russia. With more than 60 percent of the votes counted in Hungary, preliminary results indicated that Viktor Orban, Hungary’s prime minister since 2010, and already Europe’s longest serving leader, had won a fourth consecutive term despite accusations by the opposition that he has enabled Russia’s military onslaught by cozying up for years to President Vladimir V. Putin of Russia. “We...