Differences between Yemen and the Ukraine.
In one an invading force is attacking locals who are being supported with hardware from the west.
In the the other the population of the country are fighting each other depending on politics and/or religion with many factions but mainly three. One group who have pushed out the recognised government are fighting against two others who are supported by the Saudis backing one of them and the UAE the other. Both the UAE and the Saudis have the backing of the USA & UK governments. This is simplifying the situation but broadly accurate. In a nutshell what many biased media types forget is that we have an uninvited nation destroying a neighbour's lives and infrastructure. And its easy to take sides. In the other it depends on your bias, politics or tribalism which side you support but to pick on the UAE because a recognised government has asked for their help is not comparable with what is happening in the Ukraine.