Russian freight trains

[Railion 1600]

Something else about the freight trains, this time about the locomotives. Are Russian locomotives allowed in the Baltics, Belarus and Ukraine? And are locomotives from that countries allowed in Russia too, or is the security system different? For example, here in the Netherlands are only trains allowed that have the Dutch security system, the width and height aren't to high, the front have to be white or yellow that has to be at least 1 square meter (very stupid rule, I know so many trains here that don't have a white or yellow front) and for electric trains if they can run on 1500V DC.