Visa-liberalisation with Ukraine will lead to the influx of Ukrainian neonazis into Europe. Also, there is a civil war in Eastern Ukraine.
The visa liberalisation will grant Ukrainians only short-term visits to Europe (90 days every half a year), and is not connected to the issue of labour liberalisation for Ukrainians. The visa liberalisation doesn't mean abolition of border security checks. Furthermore, all Ukrainians seeking to use the visa-free regime will have to posses a biometric passport. (ceip.org/2gzwP3J), . // Repeating a myth debunked many times already, see e.g. Disinformation Review 50: bit.ly/2hrUtDG, // There is no civil war in Ukraine, there is Russian military aggression in Ukraine.