Explanation:

• The Swedish think tank, Stockholm International Peace Research Institute (SIPRI) released its 51st edition of the SIPRI Yearbook 2020 on 15 June 2020, which assesses the current state of armaments, disarmament and international security.
• Russia has 6375 warheads and United States has nuclear warheads at 5800.
• As per the report, the number of nuclear arsenal in India has increased compared to the previous year.
• India added 10 more weapons by January 2020 to the stockpile to touch 150, compared to an estimated 130-140 in January 2019.