The information you got from a service person doesn't sound right. According to Lenovo's website, the IdeaPad U430 is covered by an international warranty and all service centres around the world are obligated to honour that regardless of whether it is or when it becomes available in any market.
If the information on Lenovo's site is accurate, you're covered. It might be difficult for them, and spare parts might not readily be available, but they cannot refuse to take it in, examine it and fix basic problems.
http://support.lenovo.com/us/en/iwslookupidea
http://support.lenovo.com/us/en/documents/ht074528
"Lenovo IdeaPad Limited International Warranty Service (Referred as "IWS") provides customers with warranty service even if they relocate their IdeaPads to another country. This warranty service is available wherever Lenovo or Lenovo resellers sell and service your particular machine type." .... "Service procedures may vary by country, and some service and/or parts may not be available in all countries. Some countries may have fees and restrictions that apply at the time of service."