The Belarusian prime minister has canceled a planned trip to Russia to discuss a customs union between the ex-Soviet nations amid a rift over energy prices, according to AP. Russia's Prime Minister Vladimir Putin was set to host talks on the issue Friday with top officials from Belarus and Kazakhstan, but the Belarusian premier's office said he wouldn't attend. It did not give a reason. Belarus has insisted Russia provide it with cheap oil and gas as part of the customs union deal to take force July 1. Putin's deputy on Friday rejected Belarus' proposal to give Russia control of the nation's gas pipeline network and a top oil refinery in exchange for domestic prices on oil and gas.