The arms limitation negotiations between the Soviet Union and the United States began in 1969

The New START treaty, which limits strategic nuclear weapons, is to expire this week.

The New START Treaty was signed by the Russian and US presidents, Dmitry Medvedev and Barack Obama, in Prague on April 8, 2010

The New Start treaty has limited the number of deployed strategic nuclear warheads for both countries.

The arms limitation negotiations between the Soviet Union and the United States began in 1969

The expiry of New START jeopardizes global nuclear stability, leaving the U.S. and Russia without binding arms control measures.

The expired agreement between Moscow and Washington came into effect in 2011

The expiration of the New START Treaty on Thursday leaves no caps on the two largest atomic arsenals for the first time in over 50 years.