Sources to CNBC TV18 - 25% Additional Tariffs Will Come Into Effect After 21 Days To Give Space For Negotiations - Purchase Of Russian Oil May Not Be The Only Reason For US To Impose Addl Tariffs On India - India Will Try To Negotiate A Solution In Next 21 Days Within The Larger Ambit Of The BTA - Indian Oil PSU's Have Been Purchasing Crude Oil Globally & Are Guided By The Best Prices - Oil Imports From The US Have Significantly Gone Up In Last Six Months By Approximately 120% - Indian PSUs Are Buying Oil & Gas From US Cos & Will Continue To Increase Purchases