India, Feb. 5 -- The United States and Russia entered another phase of increased tensions after the New START treaty expired, which was their last nuclear arms control treaty. The world now faces rising worries because the United States and Russia fail to resolve their disagreements about Russian oil, Ukraine, and global security matters.

US-Russia Tension: What Is the New START Treaty and Why Does It Matter? The New START treaty, which both the US and Russia signed in 2010, restricted their strategic nuclear warheads and delivery systems to specified quantities. It served as the main mechanism to prevent nuclear stockpiling until more than ten years had passed. The treaty ended on Wednesday, which marked the end of more than five decad...