Answer:
Yes, There can still be a threat.
Explanation:
"While it has been more than twenty years since the end of the Cold War, the existence of thousands of nuclear weapons continues to pose a serious global threat. The likelihood of a nuclear war between the United States and Russia has decreased, but the continued presence of large stockpiles makes the accidental or unauthorized use of nuclear weapons a persistent risk. Many of the countries with smaller nuclear arsenals, such as India and Pakistan, are actively engaged in regional conflicts, making the possibility of regional nuclear war a concern. North Korea illicitly acquired nuclear weapons, and other countries, including Syria, have violated their nuclear safeguards commitments and are suspected of covertly pursuing nuclear weapons capabilities" (nti.org)
Terrorism also poses a nuclear threat, most notably ones are 9/11, London Bombing, and many more.