The UFA 490 submarine was spotted 148 kilometres (92 miles) west of Cape Calavite on Thursday, the Philippine military said.
"Any intrusion into the West Philippine Sea, of our EEZ (Exclusive Economic Zone), of our baselines is very worrisome," Marcos told reporters.
The Philippines dispatched a plane and a warship to the submarine, where the crew said they were awaiting good weather before proceeding to Russia's Vladivostok, the Philippine Navy said in a Monday statement.
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