Iran said on Monday that the United States sanctions over its ballistic missile test are illegal as the US arms are used against Palestinian and Lebanese people.
The US Treasury Department on Sunday imposed new sanctions on 11 Iranian companies and individuals over Iran's ballistic missile programme, a day after the lifting of sanctions over its nuclear programme.
The new sanctions also came after the release of US prisoners on Saturday.
"The Islamic Republic [Iran] will respond to these aggravating and propagandistic measures by pursuing its legal missile programme stronger than before and developing its defensive capabilities," said a statement by Iranian Foreign Ministry.
Hossein Jaberi Ansari, Foreign Ministry spokesman, said the US supplied weaponry worth tens of billions dollars each year which used to commit “war crimes” against Palestinian and Lebanese people.
"The US sanctions against Iran's ballistic missile programme ... have no legal or moral legitimacy," Ansari said.
In late December, Iranian President Hassan Rouhani said his country had the right to develop missiles and wrote a letter to the Iranian defence minister in which he ordered him to support the missile programme in response to US threats.
In response to new US #sanctions planned against Iran's ballistic missile program, have ordered the Defense Minister to expedite the program
— Hassan Rouhani (@HassanRouhani) December 31, 2015
“As the US government is clearly still pursuing its hostile policies and illegal meddling... the armed forces need to quickly and significantly increase their missile capability,” Rouhani wrote.