{
  "id": "pion-nks",
  "name": "Pion-NKS (Liana)",
  "aliases": [
    "14F139"
  ],
  "domain": "space",
  "country": "RUS",
  "category": "Naval ELINT and radar satellite",
  "status": "in-service",
  "fielded": null,
  "operators": [
    "RUS"
  ],
  "summary": "Naval component of Liana carrying ELINT sensors and an active radar, replacing US-PM and US-A.",
  "specs": [
    {
      "k": "orbit_regime",
      "v": "LEO",
      "src": [
        "gsp-pion-nks"
      ],
      "conf": "medium"
    },
    {
      "k": "sats_count",
      "v": 1,
      "src": [
        "gsp-pion-nks"
      ],
      "conf": "medium",
      "note": "Kosmos 2550, June 2021; likely only one radar antenna deployed"
    },
    {
      "k": "first_launch",
      "v": 2021,
      "src": [
        "gsp-pion-nks"
      ],
      "conf": "medium"
    }
  ],
  "payloads": [],
  "variants": [],
  "art": "satellite",
  "image": null,
  "verified": null,
  "changelog": [
    {
      "date": "2026-11-08",
      "change": "Entry created from cited open sources"
    }
  ],
  "url": "https://www.defensepedia.com/systems/pion-nks.html",
  "sources": {
    "gsp-pion-nks": {
      "title": "Pion-NKS (14F139)",
      "publisher": "Gunter's Space Page",
      "url": "https://space.skyrocket.de/doc_sdat/pion-nks.htm",
      "published": null,
      "tier": 3,
      "checked": "2026-11-08"
    }
  }
}