<h1>State hosts grand military parade with foreign leaders, sparking diplomatic dispute and formal protest over attendance</h1> A state held a large military parade displaying modern weaponry and hosted numerous foreign heads of state to mark a historical anniversary, prompting diplomatic friction with a neighboring state after that neighbor urged others not to attend; the host state lodged a formal diplomatic protest in response. The event raises legal issues concerning diplomatic engagement and immunity, international relations protocols, and potential ramifications for bilateral and multilateral agreements. The public unveiling of advanced military hardware may affect regional security assessments and arms control discussions, and could trigger diplomatic, trade or security responses under international law and state practice.