Roads leading to Russia, if completed, could enable sanctioned cargo, or even worse, Russian troops, to pour in unchecked.
'Russia has painted itself into a logistical corner with its imperialist ambitions and aggressive policies,' a railway official said.
Iran's international isolation brings risks for Central Asian countries, analysts say, warning against entering in any infrastructure or transportation agreements with Tehran.
A construction project carried out by Longhai Road and Bridge Corp. has been riddled with legal, financial and structural problems for more than 5 years, and Kyrgyz workers are fed up.
Critics accuse Chinese investment of facilitating corruption in Central Asia.
The new FlyArystan is expected to cut domestic airfares by almost half, company representatives say.
The World Bank-backed programme aims to restore deteriorating road networks in hopes of better linking the Fergana Valley and connecting population centres and economic hubs.
Kazakh port authorities have detained four freighters from Russia and Iran on the Caspian Sea for numerous safety violations.
Being able to take a single bus between Tashkent and Bishkek makes the 12-hour-plus journey more convenient, passengers say.
The move seeks to ease business and leisure travel for Kazakhstani citizens and to open up the nation's economy.