U.S. Sends 3,000 Troops To Kabul To Evacuate Embassy Staff

The US and UK are sending troops to Afghanistan to assist in evacuating civilians due to a worsening security situation in Kabul. This decision is not based on a single event but is considered a prudent response to the current conditions.

What is the current situation in Kabul that prompted this decision?

What does the statement imply about the nature of the decision to deploy troops?