Russian President Vladimir Putin on Monday congratulated Nicolas Maduro on winning the disputed Venezuelan election, and the Kremlin said it was deepening cooperation in all areas - including sensitive ones - with Caracas. -snip- "Russian-Venezuelan relations have the character of a strategic partnership," Putin said in a message to Maduro, the Kremlin said. "I am confident that your activities at the head of state will continue to contribute to their progressive development in all directions." -snip- Putin ended his message to Maduro: "Remember that you are always a welcome guest on Russian soil."