"Instead of striving for the phantom nuclear superiority over Russia, the US administration should be looking for solutions of difficult North Korea nuclear problem," Pushkov wrote on his Twitter.
The lawmaker added that Trump, who won the presidential elections as the candidate from the Republican Party, should be concerned about the rival Democratic Party planning his impeachment rather than worry about the New START treaty.
North Korea's nuclear program has been a source for concern for its closest neighbors, Japan and South Korea, and for the global community. On February 12, Pyongyang launched a medium-range ballistic missile into the Sea of Japan and declared the test successful. This and a number of previous launches were considered to be in violation of the UNSC resolution by the United Nations.
The New START treaty was signed by the United States and Russia in 2010 in Prague. The two sides agreed to reduce the number of deployed nuclear warheads to 1,550 and the number of deployed missiles and bombers to 700.