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New START is a nuclear arms reduction treaty between the United States of America and the Russian Federation with the formal name of Measures for the Further Reduction and Limitation of Strategic Offensive Arms. It was signed on 8 April 2010 in Prague, and, after ratification, entered into force on 5 February 2011. It is expected to last at least until 2021.

New START / СНВ-III
Treaty between the United States of America and the Russian Federation on Measures for the Further Reduction and Limitation of Strategic Offensive Arms

Договор между Российской Федерацией и Соединёнными Штатами Америки о мерах по дальнейшему сокращению и ограничению стратегических наступательных вооружений
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Presidents Obama and Medvedev after signing the Prague Treaty.
Type Strategic nuclear disarmament
Drafted 19 May–9 November 2009
Signed 8 April 2010
Location Prague, Czech Republic
Effective 5 February 2011
Condition Ratification of both parties
Expiration 5 February 2021
(Option to extend until 2026)
Signatories Barack Obama
Dmitry Medvedev
Parties  United States of America
 Russian Federation
Ratifiers United States Senate
Federal Assembly of Russia
Languages English, Russian
File:New START.ogvPlay media
Signing the New START Treaty (video in Russian)

New START (Strategic Arms Reduction Treaty) (Russian: СНВ-III, SNV-III) is a nuclear arms reduction treaty between the United States of America and the Russian Federation with the formal name of Measures for the Further Reduction and Limitation of Strategic Offensive Arms. It was signed on 8 April 2010 in Prague, and, after ratification, entered into force on 5 February 2011. It is expected to last at least until 2021.

New START replaced the Treaty of Moscow (SORT), which was due to expire in December 2012. In terms of name, it is a follow-up to the START I treaty, which expired in December 2009, the proposed START II treaty, which never entered into force, and the START III treaty, for which negotiations were never concluded.

Under terms of the treaty, the number of strategic nuclear missile launchers will be reduced by half. A new inspection and verification regime will be established, replacing the SORT mechanism. It does not limit the number of operationally inactive stockpiled nuclear warheads that remain in the high thousands in both the Russian and American inventories.