This example shows a small force-directed network graph of seven countries, with links weighted by connection strength. The graph visualizes relationships between nations such as the US, Russia, India, and China, using red links and sky-blue circular nodes with text labels. Built with the D3 v4 force layout (`d3.layout.force`), it applies gravity, distance, and charge parameters to position nodes. The code loads node and link data from a JSON file and enables dragging, while styling is defined through CSS classes on SVG elements.