WITHIN MINUTES OF TRUMP TRUTH SOCIAL TO PUTIN OVER UKRAINE THE US DOLLAR GAINS ON THE RUBLE BUT THEN FALLS

So, initial optimism, but then some scepticism over Trump's demand/request/suggestion to Putin.

Trump proposed huge taxes, tariffs on Russian goods into the USA at a time when the Russian economy is allegedly not doing so well.

So why the scepticism, which seems to have been curtailed due to exchange closing?