China is ourenmey no.1 in every aspect.Inspite of all the engagements with chinese India must remain carefully and vigillant as far border and security issues are concerned and must remain war-ready with top-most preparations , without repeating foolishness of Nehru and this is what history tells.Nothing has changed since 1950 when tibet was part of India. We can bargain with country if we are powerful otherwise we will have to beg.Commerce,trade and good retations are important but secondary to security and soverinity.