MOSCOW — Countries often issue travel advisories warning citizens of danger abroad: war, for instance, or a terrorist threat or an outbreak of disease. The Russian Foreign Ministry posted advice of a somewhat different nature on Monday, cautioning people wanted by the United States not to visit nations that have an extradition treaty with it.

“Warning for Russian citizens traveling internationally,” the Foreign Ministry bulletin said. “Recently, detentions of Russian citizens in various countries, at the request of American law enforcement, have become more frequent — with the goal of extradition and legal prosecution in the United States.”

Citing examples in Costa Rica, the Dominican Republic, Lithuania and Spain, the Foreign Ministry said, “Experience shows that the judicial proceedings against those who were in fact kidnapped and taken to the U.S. are of a biased character, based on shaky evidence, and clearly tilted toward conviction.”

Extradition has frequently been a contentious issue between Russia and the United States, but the disagreements have been particularly sharp in recent months over the case of Edward J. Snowden, the former intelligence contractor who is wanted on criminal espionage charges but has been granted temporary asylum in Russia.