General Alexus Grynkewich, the head of US European Command (EUCOM), notified senior Pentagon officials in writing that without another navy destroyer, he will be forced to choose between defending the US "homeland" and defending Israel. Grynkewich's warning comes as US President Donald Trump continues to escalate the war on Iran.

The US Navy has shouldered a significant burden in waging the war, including responsibility for blockading Iranian ports in response to the Islamic Republic's closure of the Strait of Hormuz.

US naval destroyers in the eastern Mediterranean have long been part of Israel's defense strategy. They are equipped with radar systems and missile interceptors capable of countering Iranian ballistic missiles and drones.

EUCOM is responsible for protecting Israel from the Mediterranean and deterring any Russian ground incursion into NATO member states.

The US Navy has five destroyers deploying from Rota, Spain, with a sixth expected later this year. They face maintenance issues due to lengthy missions. The US is also reportedly experiencing a shortage of missile interceptors, which are costly to manufacture and hard to restock.

Pentagon assessments conducted earlier in the war showed that US forces have "shouldered the brunt of defending Israel from Iranian ballistic missiles."

Washington has used more of its defensive weapons, including the Terminal High Altitude Area Defense (THAAD) and naval interceptors, to defend Israel from Iranian missile and drone attacks than Israel has used of its own interceptor stocks.

US inventories of Patriot missiles have now fallen below 1,000 and THAAD inventories to about 250, according to the Center for Strategic and International Studies (CSIS).

Israel has not participated in the war on Iran since Washington and Tehran signed a memorandum of understanding (MoU) and ceasefire in mid-June. Trump resumed attacks on Iran three weeks ago.

WaPo: "A shortage of Navy destroyers, used to defend against Iranian ballistic missile attacks, will force the head of U.S. European Command to prioritize the U.S. homeland instead officials said."

Last week, Israeli Finance Minister Bezalel Smotrich said Israel was content to remain out of the fighting and allow the US and its Gulf allies to fight the war on Tel Aviv's behalf.

"Israel has no interest in joining the campaign - the current situation is the best for us," Smotrich said on Tuesday.