Let's downgrade them from "joined at the hip" to "pretty good friends." This will enable us to pursue a more aggressive policy against ISIS, because the main constraint against doing so in the past has been our closeness to Saudi Arabia and Turkey, which have opposed an aggressive policy against ISIS.
The Republican Presidential race is unhinged by international events, as well as by President Obama's staying power. None is a credible leader for the nation. The only candidate who has offered a robust, nuanced and thoughtful strategy for dealing with ISIS is Hillary Clinton, but whether she might actually become Commander-in-Chief we won't know until next November's election. Barack Obama is president for one more year. He has responded calmly to the rush of recent events, and not let calls for World War stampede him into hasty moves. For a man who receive the Nobel Peace Prize in his first year in office, Obama has had to spend a lot of his time deciding on military actions.
President Barack Obama won election in 2008 promising an end to "dumb wars," and since then, he's vowed to avoid major troop commitments. Yet, even after all the fallout from recent interventions -- including, more recently, the spread of ISIS terrorism to Europe -- foreign policy hawks keep pushing Obama to send ground troops to Syria.