A court in Vietnam upheld a five-year prison sentence on Monday for a dissident convicted of anti-state activities who violated the terms of his probation, state media said, the latest ruling in a series against activists. Vietnam is adding pressure on foreign internet firms to keep data on local users and be more accessible to the country’s authorities as the country tightens control over online dissent. Vietnam’s leaders – some of the most authoritarian in Southeast Asia – are determined to silence all forms of dissent that cause people to question the one-party state, writes Logan Connor for the South China Morning Post.