TBILISI (Reuters) – Russia said on Tuesday it was working hard to resolve a dispute between Armenia and Azerbaijan over the Lachin corridor, the sole road linking Armenia to the Armenian-populated enclave of Nagorno-Karabakh. The mountainous route across Azerbaijan has been blocked since Dec. 12, when protesters claiming to be environmental activists stopped traffic by setting up tents. Some 120,000 ethnic Armenians in Nagorno-Karabakh depend on it for supplies of food, fuel and medicine. The standoff has raised international concern, with U.S. Secretary of State Antony Blinken calling on Mond…