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By his own acknowledgement, however, key Iranian leaders have been killed in the strikes - and Iran is currently focusing its diplomatic efforts on appeals to the United Nations Security Council, where it has labelled Israel's action an "act of war".

Pyongyang considers the loudspeaker propaganda broadcasts an act of war and has threatened to blow them up in the past.

It will be enough to harm their opponent, especially their infrastructure assets, but stop short of being an attributable act of war.

India immediately suspended the 1960 Indus Waters Treaty, a World Bank-brokered water sharing agreement between the two countries, prompting protests from Pakistan which said the stoppage or diversion of water would be "considered as an act of war".

Denmark would break off relations with the U.S. and insist, with a certain amount of hedging, that this was an act of war, sort of.