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What is the difference between a “Type One” and a “Type Two” inspection?

The New START Treaty provides for 18 on-site inspections per year. There are two basic types of inspections. Type One inspections focus on sites with deployed and non-deployed strategic systems; Type Two inspections focus on sites with only non-deployed strategic systems. Permitted inspection activities include confirming the number of reentry vehicles on deployed Intercontinental Ballistic Missiles (ICBMs) and deployed Submarine Launched Ballistic Missiles (SLBMs), confirming numbers related to non-deployed launcher limits, counting nuclear weapons onboard or attached to deployed heavy bombers, confirming weapon system conversions or eliminations, and confirming facility eliminations. Each side is allowed to conduct ten Type One inspections and eight Type Two inspections annually.

New START Treaty Inspection Activities Treaty Year Ten
(February 5, 2020 – February 4, 2021)

Inspections Conducted by the United States

Type One Type Two Total
Inspections Allowed 10 Inspections Allowed 8 Inspections Allowed 18
Inspections Conducted 2 Inspections Conducted 0 Inspections Conducted 2
Inspections Remaining 8 Inspections Remaining 8 Inspections Remaining 16

Inspections Conducted by the Russian Federation

Type One Type Two Total
Inspections Allowed 10 Inspections Allowed 8 Inspections Allowed 18
Inspections Conducted 0 Inspections Conducted 2 Inspections Conducted 2
Inspections Remaining 10 Inspections Remaining 6 Inspections Remaining 16
Current as of November 19, 2020

Total Inspections Conducted Under the New Start Treaty

Treaty Year United States Russian Federation Total
Treaty Year 1 18 18 36
Treaty Year 2 18 18 36
Treaty Year 3 18 18 36
Treaty Year 4 18 18 36
Treaty Year 5 18 18 36
Treaty Year 6 18 18 36
Treaty Year 7 18 18 36
Treaty Year 8 18 18 36
Treaty Year 9 18 18 36
Treaty Year 10 2 2 4
Total 164 164 328

U.S. Department of State

The Lessons of 1989: Freedom and Our Future