CHILMARK, Mass. (AP) — President Barack Obama on Thursday canceled joint US-Egypt military exercises, saying America’s traditional cooperation with Egypt ‘‘cannot continue as usual’’ while violence and instability deepen in the strategically important nation.

It’s unclear whether scrapping the Bright Star exercise will have any impact in stopping the clashes between Egypt’s military-backed interim government and supporters of ousted President Mohammed Morsi. And Obama gave no indication that the US planned to cut off its $1.3 billion in annual military aid to Egypt.

Speaking from his vacation home on Martha’s Vineyard, Obama said the US wants democracy in Egypt to succeed. But he said achieving that outcome is not the responsibility of the United States.