"The expansion of the war will be inevitable if Israel continues its attacks against the civilian population of Gaza," the diplomat said.
According to him, there are other resistance forces in Lebanon and Yemen that can step up their actions.
At the same time, Abdollahian added that Italy should put pressure on the United States, which controls Israel's military power, to achieve an immediate ceasefire.
Earlier, Iranian Defense Minister Mohammad Reza Ashtiani threatened the United States with a serious blow if the American side does not stop the war in the Gaza Strip.
Serbian President Aleksandar Vučić also said that military conflicts in the Middle East could escalate into a world war.