Malaysia’s former prime minister Najib Razak is barred from political activity and media appearances under house arrest, according to the home minister on Thursday. Any breach will send him straight back to prison. The announcement will remove any ambiguity about Najib’s possible role in the Melaka state election on Saturday and help shore up the credibility of Prime Minister Anwar Ibrahim’s government, already facing recriminations for not being able to stop the house arrest, an expert...