As for selling weapon systems, got news for you, England sells to more then a few questionable regimes...granted compared to US or Russian equipment, English equipment is pretty much second class these days....but: Jordan? A country that initiated several wars and tried to exterminate a large portion of its own population...Egypt?...yeah, Britian is quite guilty in that department too, all the countries are. Just because you don't consider who you sell to as a threat, doesn't mean someone else doesn't. Russia wanted Saudi Arabia bombed...but to England and America it was a friendly nation...a friendly nation that sponsers half the terrorist/jihad groups in the world and is now reported as trying to purchase large quantities of WMD....so much for friendly.
But I bet Britain doesn't sell to China, North Korea and Iran. Its strange how Putin sucks up to the Americans to get financial aid and is keen to ally Russia to the USA in its war on terrorism, but simultaneously helps the USA's most deadly enemies.