It would be true if you were to mention about our special flavor of freedom exportation during the cold war. However, this time Ukraine is a democratic nation being invaded by our biggest political rival, Russia.
In a political sense, well, that's much more debatable. The problem there is that because the US itself did not feel threatened, US aid came with a price tag: the impoverishment of Britain and the demolition of the trade barriers around the British Commonwealth. US aid was on a cash-only basis until Britain had spent all its hard-currency reserves (both gold and negotiable securities). Then came the Lend-Lease agreement -- arguably the point where the US truly entered the war -- and its price tag was explicit, although unadvertised: the agreement itself contains a clause stipulating the removal of the Commonwealth's trade barriers.
The UK paid the US all it's gold reserves. Next it stole of the UK people's gold to use that to buy weapons.
The US was not giving the UK when it exported, it was selling. Lend lease came in once the UK ran out of gold. So the US gave them credit: which the UK tool until 2006 to repay.
The US joined WW1 when it became clear that the UK would not be able to repay its debt to JP Morgan and its clients if Germany won. Of course, that was not the only reason, but it was a huge factor. (Source: Adam Tooze, The Deluge)
(London had, bizarrely, decided to bankroll the Russian and French war efforts in addition to its own, so its debts were vast.)