Iran has formulated its positions and demands in response to recent ceasefire proposals conveyed via intermediaries, a foreign ministry spokesperson said on Monday, adding that negotiations were "incompatible with ultimatums and threats to commit war crimes."

Spokesperson Esmaeil Baghaei said Tehran had a set of requirements based on its national interests that had already been conveyed via intermediary channels, adding that earlier U.S. demands such as the 15-point plan were rejected for being "excessive."

"Iran does not hesitate to clearly express what it considers its legitimate demands and doing so should not be interpreted as a sign of compromise, but rather as a reflection of its confidence in defending its positions," Baghaei said in a press conference.

"We have formulated our own responses" and will announce details in due time, he added in response to an Iranian journalist's question regarding ongoing efforts to bring about a ceasefire between Iran and the U.S.