in apparently goading Trump into a new nuclear arms race. Clearly he hasn't learned the lessons of history. Last time round when Reagan faced off Brezhnev-Andropov-Chernenko it nearly bankrupted the then Soviet Union and was a factor in its collapse.
FFS, as at the beginning of last month Russia had 1796 operational nukes (out of an inventory of 7300) which more than matched the USA's 1367 (from an inventory of 7100). More than enough to end world civilization many times over. Both countries need more nukes like they need holes in the head.
And that perhaps is what Putin has in his and Trump does himself no favors by responding to the challenge. No Xmas present for either country.