<h1>Diplomatic dispute over foreign leaders attending large military parade featuring domestic weapons raises immunity and arms-control compliance questions</h1> A state conducted a large-scale military parade displaying modern domestically produced weaponry, attended by numerous foreign heads of state, commemorating a historic conflict anniversary; another state formally protested to the host after urging third states to avoid participation, raising diplomatic friction. Legal issues include interstate diplomatic relations and immunity of visiting dignitaries, potential implications under arms control and non-proliferation frameworks if displayed systems raise treaty concerns, and sovereign rights to public military demonstrations. The event may affect bilateral and multilateral relations, trigger reciprocal measures or diplomatic protests, and prompt scrutiny of compliance with applicable international obligations.