Just tell him: "俺直接老板说,他们并不着急架设那个系统。那东欧小子太狡猾。"
Plus something like: you appreciate his interests in your work, but now you need to focus on your work (and so that you can get something to feed yourself and your baby, does he have any problem with that?).
这东欧人做事的方式有点象四川人说的:“猪尿泡打入,痛倒是不痛,气涨人!”。