MOSCOW (AFP) - Russia is to host President Asif Ali Zardari and Afghan leader Hamid Karzai for a summit on regional security this week, the Kremlin said on Monday. Russian President Dmitry Medvedev will host the summit in the Black Sea resort of Sochi on Wednesday, the Kremlin said in a statement. Also taking part will be Tajikistan President Emomali Rakhmon. The Pakistani presidency said last week that Zardari - under fire over his handling of the flood tragedy at home - would still take part in the meeting but had cut back his visit from two days to a few hours. A spokesman for Karzai said the Afghan president would have bilateral meetings with Medvedev and Zardari, besides taking part in group meetings. The talks would address regional issues, economic issues, Waheed Omer told reporters, adding that Karzai would leave for Russia on Tuesday.