The Czech Security Intelligence Service (BIS) said they have discovered the network of Russian and Chinese spies over the last five years.

BIS Michal Koudelka said on December 7 that his service “has never been as successful as it has been in the last several years”, RFE/RL reported.

His comment came as a rejection of President Milos Zeman's accusations that they were providing wrong data about spying activities.

BIS says a number of spies are working as diplomats in the Russian embassy in Prague.