Over the past several months The Islamic State (IS), a terrorist organization that claims sovereignty as a caliphate over most of the middle east, has gained control over vast amounts of territory in Eastern Syria and Western Iraq. The groups rapid advance as well as their brutal tactics has led to the formation of a U.S. led coalition to destroy the organization. Despite the large amount of countries that have pledged to aid this coalition many are hesitant to provide more than training, aid, and air support with no countries currently pledging ground troops leaving ground fighting to opposing rebel groups, the Iraqi and Syrian armies, and the Iraqi Kurds.
This coalition is a good way to look at the resolve of countries and why actions taken against different states will yield different results. As of september 17th, 11 countries have officially pledged some form of support while several others have been linked to possible aid by the state department. These different countries and the levels of support they are willing to pledge is indicative of the levels of resolve each of these countries have for conflict with The IS.
Turkey for example is a country that has alot to gain or lose depending on the stance they take. Turkey has been vying for acceptance into the EU for years and supporting a NATO effort could prove to be politically prudent move for them. At the same time turkey has been reluctant to make any official stance on The IS, including joining the coalition, in order to protect its 49 diplomats currently being held hostage by The IS.
Another country that has a special stake in defeating The IS is Australia. A terrorist plot orchestrated by The IS was recently thwarted in Sydney and Brisbane. Involving 800 Australian police, a cell was caught supposedly planning to publicly behead a randomly kidnapped Australian. The cell was believed to be radicalized in Syria and Iraq. This has prompted Australia to pledge one of the largest commitments other than the US, while still short of deploying ground troupes.
These are just some of the reasonings that these countries have to either enter or avoid conflict. There are also many others including economic, social, and political reasonings domestic, and international.