Putin sets nuclear forces on high alert

A sign warning of radiation, taken in Pripyat, Ukraine, April 2017. OVER 30 years after the nuclear disaster of Chernobyl, the city of Pripyat is exactly as it was the day it was evacuated. On the afternoon of April 27, 1986 a population of almost 50,000 abandoned the city following a catastrophic nuclear accident. Andreas Jansen / Barcroft Media via Getty Images

In response to what he's referring to as "aggressive statements" by NATO, Vladimir Putin has put Russia's nuclear forces on high alert as of Sunday morning. 

"Western countries aren't only taking unfriendly actions against our country in the economic sphere, but top officials from leading NATO members made aggressive statements regarding our country," Putin said in televised comments.