Tens of thousands of people gathered in Cambodia’s capital Phnom Penh on Wednesday for a march to show their solidarity with the government and military, amid soaring tensions with neighboring Thailand following a border row that erupted last month.

As we share a long border, we both know that we have to live and grow together,” Thailand’s then-Ambassador to Cambodia Panyarak Poolthup told Cambodia’s then-Prime Minister Hun Sen. “The political will is always there to resolve any issues that may arise.

With nationalistic sentiment now mobilized in both countries, tensions will likely get worse before they get better.