It's not safe for Americans to travel to Russia right now: Former American ambassador

Americans might not be safe traveling to Russia right now, despite the State Department only issuing a "Level 2 travel advisory" on the country.

Former Russian Ambassador Michael McFaul issued a surprising warning in wake of Paul Whelan being taken into custody by Russia on the accusation of spying. Whelan's brother said that he was attending the wedding of a long-time friend and that his brother is far from a spy.

"I often get asked if it’s safe to travel to Russia as a tourist or student. I always used to say yes, and with enthusiasm. After Whelan arrest, however, I will change my advice," McFaul tweeted Wednesday.

"Exercise Increased Caution due to terrorism, harassment, and the arbitrary enforcement of local laws. Some areas have increased risk. Read the entire Travel Advisory," the State Department website reads.