On paper, there was plenty in Donald Trump's comments to rile the Kremlin.

For starters, his description of Russia as a 'paper tiger' that had been 'fighting aimlessly' in Ukraine.

Moscow won't like that.

I remember when President Barack Obama described Russia as a 'regional power', as opposed to a global one: that was taken as a big insult here.

President Trump's suggestion that Ukraine could win back all the territory Russia had seized will have raised eyebrows, too, in Moscow.

And Russian eyebrows will have shot up even higher after Trump's reply to a reporter's question.

'Do you think that NATO countries should shoot down Russian aircraft if they enter their air space?' the reporter asked.

'Yes, I do,' replied Trump.

Yet the Kremlin's initial response to all of this has been rather restrained.

Vladimir Putin's spokesman Dmitry Peskov gently brushed aside the 'paper tiger' insult.

'Russia's in no way a tiger,' Mr Peskov to a Russian radio station. 'It's more associated with a bear. And there is no such thing as a paper bear.'

On a Kremlin conference call for journalists, I ask Dmitry Peskov for his reaction to Trump's comments.

'Russia, in general, and President Putin in particular value highly President Trump's political will to continue working towards a peace settlement,' Peskov replies.

Today's edition of the Izvestiya newspaper suggests the first reason for Russia's measured tone: 'It's important to remember that Trump is influenced by the last person he has spoken to... In this case it was Zelensky.'

But what about the threat to shoot down Russian aircraft?

The Kremlin's response: denial.

Despite the critical comments regarding Russia's economy, the Kremlin insists that the economy is not in dire straits. However, pressures from sanctions and war spending have caused budget deficits and concerns about fuel supply.

For now, Vladimir Putin seems determined to push on with the war in Ukraine, undeterred by Trump's remarks.