Which country in December 2019 lifted the veil on its tightly guarded space-based missile warning system named Kupol ?

Question

Accepted Answer

Russia. Russia is correct because it revealed the Kupol system in December 2019. Israel did not lift the veil on this specific system at that time. China's involvement with this particular system was not reported for that date. The USA did not reveal a missile warning system named Kupol in December 2019.