Um, prometheus, you might be a little wrong here. There is very little influx of Bangladesh or Nepali workers coming to the Czech Republic (which means -here-). One strong Asian community is here, though, and is here for quite a long time - the Vietnamese. The roots of the community reach towards the time of the bloody stupid communist rule: Vietnam was in the Soviet sphere, too, so, to encourage "brotherhood", the Vietnamese were encouraged to move over. A few of them did. After the Velvet Revolution of 1989, more started coming, because they could see an opportunity here, and there - indeed - was one. They basically run the building-free markets. They do manual labor - not hired, though, but self-employed, and whatever they make they also sell in these markets and stalls. It's cheap stuff all right, but sometimes, you get things which don't disintegrate one day after warranty expires, and these are pretty good value. However, the Vietnamese community is not getting any stronger number-wise, what they are doing is that some earn enough money to run pretty good businesses, so they are starting to find their niche in the middle classes.
There is also an influx of Asian - most notably, Korean - companies. Two large car factories have been erected within the last few years, and another one is due. But neither the Vietnamese, nor the Koreans are hired manual labor people. These would be the Ukrainians, and their invasion has also ceased considerably during the last, uh, three years.
As far as our northern neighbors are concerned... the well-known abbreviation comes to mind: what?

The Kaczynsky twin potatoes are not the worst (which does say something...), though, the worst one out there is the League of Catholic Families (NOTE: do not confuse with anything remotely connected to a viable religion) party and the education minister that comes from this party. That man is insane very much in the way that has been suggested already:
Their particular brand of diplomacy won hearts and minds last week when they reckoned they should get a higher share of votes in EU matters, because if Germany hadn't started WWII then they would have a much higher population. 