The Pentagon has managed to rush deliveries of munitions to assist the Ukrainian resistance to the Russian invasion with a steady stream of flights to neighboring countries – with weapons getting into the hands of the military.

This includes landing as many as 17 planes a day in one undisclosed country near the border.

Chairman of the Joint Chiefs of Staff Gen. Mark Milley visited an undisclosed airfield near the border where he was able to inspect the historic effort to arm Ukraine as it seeks to counter Russia's invasion, CNN reported. 

Milley visited Poland last week, the Pentagon reported in a brief readout of his trip, where he met with his Polish counterpart, then visited US troops in Lithuania.

Defense officials have said while Russia continues to fire long-range artillery at Ukrainian cities and make some territorial gains in its south, it has not yet attacked supply transfers.  

This includes providing 17,000 anti-tank missiles and an additional 2,000 anti-aircraft missiles – at a time when video on the ground has showed decimated Russian trucks and armored vehicles, while Ukrainian forces report downing helicopters and other aircraft.

The Pentagon said again on Monday that Ukraine's airspace was 'contested.'

'There continue to be efforts by the United States and other nations to continue to provide security assistance material to the Ukrainian Armed Forces,' Pentagon spokesman Adm. John Kirby said Monday. 'I'm not going to talk about the manner in which that material is getting to them, but we know it's getting to them and that they are able to use it.'

Asked at the Pentagon briefing if the Russians were trying to interdict or stop the shipments, Kirby responded vaguely: 'That traffic and that material continues to flow,' he said.