It is not as if we have always found it difficult to make judgments about invasions. When the Soviet Union invaded Afghanistan, we knew what was our position, although our official position was neutral. When Vietnam invaded Cambodia – to drive out the most appalling regime the world had seen since Hitler, which killed perhaps 20% of its population, deliberately and callously, in the pursuit of a most profoundly savage ideology – we refused to recognise the new Government of that country. We persisted in recognising the tyranny of Pol Pot, for the best part of 20 years, in the interests of power politics. Let us not pretend that in our strategic interest we are not allowed to say what we think about major issues. I challenge the Government, as I have done on previous occasions, to say what it thinks about this war.