The EU wants answers from Hungary about work visas for Russia and Belarus / Hungary law could make Ukrainian refugees homeless / Hungary's visa relaxations for Russian citizens comply with EU rules, security measures / Slovakia's new government announces a massive deployment at the Hungarian border to curb migration / Slovakia begins border checks with neighboring Hungary in an effort to curb migration / Slovakia reintroduces checks on the border with Hungary to curb migration / United States imposes travel restrictions on Hungarian citizens over verification concerns