Security is a big reason for Britain's interest, with the prime minister describing the security threat from Somalia as real and substantial amid fears that the country will become a training ground for extremists who will attack western targets.
Western countries, although largely sympathetic to the rebels, were reluctant to provide substantial military aid for fear that it would strengthen Sunni extremist groups within the rebellion.
Yet many Yemenis now doubt that anything substantial has changed and fear that the much-hailed "Yemen model" is enshrining a fragile stability at a time when decisive action is needed.
Known gunmen/lawmen were generally effective, and in time the violence would subside, usually after the gunman/lawman had been involved in several shooting incidents, eventually leading to a substantial and well earned fear that kept everyone in line.
Among other concerns, the agriculture interests, which hold substantial sway in the Capitol, fear that a new regulatory system could affect property values.
Mr. Netanyahu's comments were not just the latest evidence of a growing rift between the longtime allies, but also expressed an unspoken fear that a more substantial shift might be under way in Germany.
Many now fear that without a more substantial ground offensive, YPG forces will be unable to prevent the fall of Kobani.
Part of the explanation has to do with fear that patent expirations will trigger substantial competition to sell K-Cups this fall.
Indeed, there is evidence that in chronic pain patients reporting substantial fear of (re)injury/movement, GEXP is successful in reducing pain disability.
This comet apparently made a substantial impression on the public, inspiring in some a fear that judgement day was imminent.
A substantial federal tax credit is set to end in January, and investors fear that it won't be renewed.
