The two-day dialogue between the United States and Russia ended in Vienna, the capital of Austria. After the meeting, Marshall billinsley, the special representative of the United States on arms control, said that there were still many differences between the United States and Russia on arms control. Russian Deputy Foreign Minister Sergei Ryabkov said on the same day that Russia urged the United States to focus on bilateral negotiations on the new START treaty. After the meeting, Ryabkov said: the United States has not closed down the option of extending the START treaty, but it is still not ready to reach an agreement on it. They reserve the option to take the next step. The United States is trying to create some problems and wait for Russia to meet their requirements. Ryabkov said that Russia supports the extension of the new START treaty, but it cannot pay any price for it. He urged the United States to focus on bilateral negotiations on the treaty. However, the Russian representative said that the differences between Russia and the United States at this stage are still very big. At a telephone news conference held after the meeting, U.S. special representative for arms control, Billingsley, said that the United States and Russia had extensive discussions on international security issues. The United States believes that there are many shortcomings in the new strategic arms reduction treaty, and the two sides have differences on many key issues. Billingsley said the United States has proposed that the new agreement should cover all warheads and also include improvements to the verification system. The new strategic arms reduction treaty signed by the United States and Russia in 2010 will expire in 2021, which aims to limit the number of nuclear warheads and delivery vehicles deployed by the United States and Russia. After the Sino Missile Treaty of the United States and Russia expired in 2019, the new strategic arms reduction treaty has become the only arms control treaty between the two countries. The new round of arms control dialogue between the United States and Russia has ended, but there are still many differences on the issue of arms control. The new strategic arms reduction treaty signed by the United States and Russia in 2010 will expire next year. This treaty is also the only arms control treaty between the two countries after the expiration of the Sino Missile Treaty between the United States and Russia in 2019. Russia has repeatedly expressed its willingness to extend the validity of the treaty without preconditions, but the United States has been indifferent. Why does the United States have this performance? What is the ultimate goal of the United States? Let’s take a look at the analysis of Du Wenlong, our special commentator.