Shortly after the 1998 nuclear tests, a report in the Indian press quoted a report in a small provincial Russian newspaper as saying that 'India has pure fusion bombs and can do things in the nuclear weapons field that the United States and Russia can only dream of'. In a thermonuclear weapon, a fission trigger made from plutonium or uranium or a combination of the two is needed to create the conditions in which a fusion reaction can take place.
In a pure fusion bomb, the fusion reaction is accomplished by other means, such as by lasers. Despite trying, no country so far has been able to create a pure fusion bomb -- leaving out the above report about India having done so. Among the many advantages of pure fusion bombs, no uranium or plutonium is needed for them and their yield can be made the equivalent of thousands of tons of TNT or as little as one or two tons of TNT -- no more than a conventional bomb but this yield can all be in the form of deadly radiation which at present can only be obtained from a neutron bomb that has fairly substantial explosive effects equal to hundreds or thousands or millions of tons of TNT.
An attack on the United States by India with thousands of pure fusion bombs will enable India to kill off the population of the United States without creating the side effects that the detonation of thousands of thermonuclear weapons that are not pure fusion weapons will have.
Nothing further has been heard about India having pure fusion bombs since the above report. In the absence of any confirmation, it is prudent to proceed on the assumption that India does not have them. Pure fusion bombs will also dispense with the necessity for uranium or plutonium for making weapons. Assuming India does not have pure fusion bombs, an important point is that a virtually unlimited amount of uranium is available from sea water so India has no need to depend on any other country for uranium. If you do a Google search on "uranium sea water", you will find lots of information on this, including facts such as i) Japanese scientists in the 1980s demonstrated the economic viability of obtaining uranium from sea water and, because of increases in the price of uranium since then, it is even more viable today; ii) a U.S. government panel recommended obtaining uranium from sea water and it has not been pursued by the U.S. only because the U.S. has other ready sources of uranium (also because the United States did not want countries like India to tap this source because it will wreck its non-proliferation efforts and attempts at trapping India through the nuclear deal, etc.); iii) "The Bhabha Atomic Research Centre (BARC) in Mumbai has developed a method for extracting uranium from sea water, according to the BARC annual report.
The BARC method involves passing sea water through a specially made radiation induced polymer that will selectively absorb uranium. Laboratory studies showed that the material could absorb as much as 45 per cent of uranium present in sea water. The report said that on the basis of laboratory data, BARC is getting ready to build, in the first step, a bench scale plant that will produce 100 grams of uranium per year from sea water. Bigger plants will be decided after working out the cost benefit analysis. Well, the price of uranium now is such that uranium from sea water will be much cheaper than from other sources. And there is an essentially unlimited amount of uranium ( 4.6 billion tonnes ) available from sea water.