Belarus refused to purchase the Russian S-400 anti-air defense system.
According to Belarussian media Naviny, Belarus is against the presence of Russian military specialists in their territory. Belarus would agree with a deal for purchasing the complexes if Belarusian specialists are on duty or in the other way the negotiations will not go on.
Military experts also consider that Belarus is a small country and doesn't need S-400. Belarus has deployed S-300 systems which quite enough to ensure the protection of the air zone.
Noting that the S-400 anti-air defense system has been deployed in China and then Turkey. It was also reported that Russia has deployed S-400 systems in Syria as the tensions escalate.