What are two reasons the arms race increased tensions?

In 1949, the USSR tested its first atomic bomb. This led to a race between the two superpowers to amass the most powerful nuclear weapons with the most effective delivery systems. ... Tension was greatly increased as a result of the developing arms race which served to militarise both sides and bring war closer.Nuclear arms race, that is. ... The nuclear arms race was a competition between the United States and the Soviet Union for nuclear weapons superiority lasting throughout the Cold War. The nuclear arms race began in earnest immediately after the United States successfully exploded two atomic bombs over Japan in 1945.The United States' use of nuclear weapons to end World War II led to a determined and soon successful effort by the Soviet Union to acquire such weapons, followed by a long-running nuclear arms race between the two superpowers. The Soviet Union conducted its first nuclear test in 1949.

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