A senior member of a Russian think tank whose ideas sometimes become government policy has suggested Moscow consider a "demonstrative" nuclear explosion to cow the West into refusing to allow Ukraine to use its arms against targets inside Russia.

The proposal, by Dmitry Suslov, a member of the Moscow-based Council for Foreign and Defense Policy, was issued a day after Russian President Vladimir Putin warned the West that NATO members in Europe were playing with fire by proposing to let Kyiv use Western weapons to strike deep inside Russia, something he said could trigger a global conflict.

Ukraine's leadership says it needs to be able to strike Russian forces and military targets inside Russia with long-range Western missiles to be able to defend itself and prevent air, missile and drone attacks, a view which has found some support among some Western countries but not yet with Washington.