The Biden administration has announced new sanctions targeting Iran's ballistic missile and drone programs in response to Iran's violation of the terms of the 2015 nuclear deal and its expansion of its nuclear program. While the remaining UN restrictions on Iran's ballistic missile program have expired, countries like the US, Germany, France, and the UK will maintain their own national sanctions. The US and 45 other countries have expressed concern about Iran's proliferation of missiles and drones and have committed to taking measures to prevent their supply and transfer. Some experts argue that reimposing UN sanctions would not be effective and could lead to retaliation from Iran. Iranian officials have labeled the decision to keep sanctions on Tehran as "illegal."