Thailand occupies a central position in mainland Southeast Asia, bordering Myanmar, Laos, Cambodia, and Malaysia, and is a founding member and key hub of ASEAN. It is a constitutional monarchy with King Vajiralongkorn as head of state, while government has long been shaped by a recurring tension between elected civilian governments and a powerful military and royalist establishment that has staged repeated coups. The Pheu Thai-led government under Prime Minister Paetongtarn Shinawatra reflects the durable political influence of the Shinawatra family, a recurring fault line in Thai politics. Thailand maintains a longstanding security alliance with the United States while balancing deepening economic ties with China, and faces periodic border frictions, notably with Cambodia.