What will it take for more countries to start supplying arms to the Free Syrian Army?

The Free Syrian Army (FSA) has a number of hurdles to overcome in order to have more international support. The most prominent three are:

1) Lack of Coherent Future-Vision and Unity: The Free Syrian Army is a motley crew of various different militias that all foresee different futures for Syria. These militias operate separately with minimal communication between them. Some want a more secular democracy, some want a theocratic Islamist dictatorship (along the same lines, but slightly different from Islamic State), and numerous others want something in the middle, like an Islamist republic (a la Erdoganist Turkey) or a democracy without countermajoritarian protections (such as mob rule). Contrary to the Kurds, the Assad Regime, or Islamic State, the FSA fighters are not unified militarily or ideologically. Many Western countries do not want to support any groups other than those who believe in secular democracy, but cannot identify which ones those are.

2) Lack of Victories: Simply, the FSA has had very few military victories. It does not make sense to support a group that cannot make successful territorial advances. The investment is less likely to pan out positively.

3) Lack of Historic Alliances: The Assad Regime has historic alliances with Russia for naval bases and with Iran for political issues. The Free Syrian Army has no similar alliances nor has it made any pledges or incentives for foreign powers to support it.

As a result, in order for more countries to take the FSA seriously, they need to unite behind a coherent future-vision, begin to actually emerge victorious from a few battles, and assert that they will respect or support the kinds of alliances that the Assad Regime had promised to support.