This example shows a network of draggable nodes connected by links, rendered with SVG inside a React component that uses d3.forceSimulation to compute positions. Clicking a node enables an attack button that injects a new red node and link into the graph. The code builds the visualization with d3.forceLink, d3.forceManyBody, and d3.forceCenter, and handles dragging through d3.drag. Static data defines three initial nodes and two links, with no external data source.