Guardian: Russia has agreed to help Venezuela build its first nuclear power station in a move likely to raise concerns in Washington about increasingly close cooperation between Moscow and Caracas. President Dmitry Medvedev announced the move at the end of a two-day visit to Moscow by Venezuela’s president, Hugo Chávez. The Venezuelan economy is overwhelmingly reliant on oil and Chávez has said he wants nuclear power to diversify energy supply. Medvedev has implicitly acknowledged the …