The US is clearly trying to provoke some kind of conflict, if not a war. Trump wants regime change in Venezuela for some reason.
That said, Trump likes to make threats so he could be trying to bluff Maduro into leaving the country.
Yesterday, the US seized an oil tanker carrying Venezuelan crude.
On Ukraine, Trump said he thought they were 'very close' to a deal. Again, it's hard to take what he says literally and get excited about peace in Ukraine or war in Venezuela.