Launched in the early hours of Wednesday and codenamed Polisia, the operation is being overseen by Ukraine's State Border Guard Service, kresy24.pl reported.
The country's army, police and National Guard are also involved as Kyiv works to prevent a migrant crisis of the kind taking place on Belarus's border with the European Union, and also to forestall any illegal activity, according to the rbc.ua website, as quoted by kresy24.pl.
"There is a danger that the crisis could spread, with migrant flows being redirected to Ukraine," said Volodymyr Nikiforenko, deputy head of Ukraine's border agency, as cited by kresy24.pl.
Ukrainian forces will seek to prevent this by stepping up controls as well as by patrolling and monitoring the Belarus border. This is expected to be accomplished with the use of planes, unmanned flying vehicles and other equipment, the Polish website reported.
In addition, a network of checkpoints will be set up in the border zone, with Ukraine's law enforcement officials also patrolling highways, key roads leading to the frontier, as well as railway and bus stations, according to Ukrainian news reports cited by kresy24.pl.
Meanwhile, special preventive measures are due to be introduced in border towns and villages, kresy24.pl also reported.