I wasn't aware that Monsanto was banned from operating in certain countries, but I do know that much of Europe has banned GM foods. it started similarly to what's going on in the US now - anti-GM advocates campaigning for mandatory labeling laws indicating which foods have been genetically modified (which is fundamentally meaningless because it's no secret to anyone who looks for information, and the mandatory labels make no mention of WHAT modifications have been applied), followed by boycotts and nonstop scare campaigns.
the main problem I have with the push against GM produce is that campaigners think all GM foods are the same - even if some items on the market were to cause tumors or cancers, which I've never seen reliable evidence for anyway, it doesn't mean that all GM foods are dangerous.
without GM crops, specifically drought-resistant, many, many people who are alive today would have starved. some items' potential safety issues or the industry at large's poor business ethics don't warrant the complete shutdown of GM food science.