That would depend on whether they are ceramic tiles or more vinyl tiles.
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Answer from Choices (http://www.choicesflooring.com.au/vinyl/) Generally, cushion vinyl is laid loosely so any imperfections in the floor don't show through over time. It can also be glued down, but the flooring needs to be completely level. Vinyl tiles or planks are glued down so the surface needs to be completely level, which is done by applying a self- leveler to the floor if required.
If the vinyl is down tight , the answer is YES, Laminate con go over it
Vinyl.
No, you can't. It would peel off like sunburned skin, if it ever even set up. And why in the world would you want to do that anyway? Yes you can; http://www.nauticexpo.com/prod/polyflor-voyager-flooring/vinyl-floor-coverings-for-ship-31432-193520.html
Yes you can, however, ensure that this is the best option before executing. I do this to reinforce the self-stick vinyl tile and laminate flooring in my basement and it works great. I got tired of dropping a knife or something creating a huge gash requiring replacement. The polyurethane layer has protected my floors for years. Occasional reapplication of polyurethane in spots where needed making it look new brand new again versus cutting out and re-sticking a piece of the laminate floor that will never look as good as new...I use the former. There are a lot of nay-sayers out there about polyurethane on vinyl tiles and laminate floors, but I've always had great success.