Several countries often take a hard stance against other countries when they suspect them of preparing to wage war against them. Others will wait for undeniable evidence, this could prove to be disastrous as they will have been targeted before they have a chance to stop any pending strike. These actions will create diplomatic relations to be stretched and sometime collapse.
Countries such as Russia and the USA will often act first and think later. Recently the USA defence team declared they had struck Al-Baghdadi and the Delta forces video of the strike has now been shared for the entire world to see. This video displays their actions on the given day and appears to confirm everything which the Americans had revealed.