'Abomination of Desolation'
At the time of the end (Dan11:40) the king of the South will attack Iran, and this will force the Antichrist or Endtime king of the North (leading Iran, Iraq and Syria) to fight back. All these years, whenever the kings fight, there were no external interferences. However, in this World War 3, involving the Antichrist it will be very different.
Dan 11:30 For ships from Chittim (land of the West) shall come against him; therefore he shall be grieved, and return in rage against the holy covenant, and do damage. So he shall return and show regard for those who forsake the holy covenant.
Another version from 'God's Word Bible',
Dan 11:30 Ships will come from the west to attack him, and he will be discouraged and turn back. Angry at the holy promise, he will return, take action, and favor those who abandon the holy promise. (GW)
When the Antichrist counter-attacks the South, ships of the West will attack him and thus expanding World War 3.
Map of Middle East - From the above map, it is impossible for ships in the Mediterranean Sea (West of Iran) to attack Iran and even fighter aircrafts are out of range. From the map, west of Iran are Iraq, Syria, Kuwait, Qatar, Bahrain, Saudi Arabia, UAE, etc. and these Arab nations do not need ships to attack Iran. Beyond these nations will be the Mediterranean Sea. So it is not possible for the ships from the Mediterranean Sea (West) to attack Iran.
Chittim means lands of the West or Western nations
So the interpretation of ships from Chittim will best be ships from the Western nations.
Note: - The 5th Fleet is a numbered fleet of the United States Navy. It has been responsible for naval forces in the Persian Gulf, Red Sea, Arabian Sea, and parts of the Indian Ocean since 1995.
So when the Antichrist (Iran) counterattacks the Sunni Arab nations of the South, the 5th US fleet (ships of the Western nation) based in the Persian Gulf and Arabian Sea will immediately send fighter jets, bombers, missiles, etc. to protect the various US military bases in the middle East from the attacks of Iran. These aerial attacks are also targeted to destroy the Iranian military arsenal and bases.
Note: - Iran has constantly threatened the West (US, UK and EU), that if Iran is attacked then he will wipe out all Western Military bases in the middle East.
These 2,500 year old prophecies of the Shia's Endtime Northern Kingdom or Alliance, the Antichrist or Endtime king of the North, and the 5th US fleet attacking Iran from the Arabian Sea were given in such simple to understand details.
No wonder, faithless Theologians and Historians condemned the book of Daniel as fake for the prophecies were fulfilled in great accuracies during the conquests of the Grecians and Romans.