He behaved like the asshole he is. He has also said he doesn't understand what NATO is for. For one thing, the ONLY time Article 5 came into play was when our NATO allies supported us in the wake of 9/11. Actually sent troops to Iraq and Afghanistan.
We own graveyards there? From WWI and WW!!? Trump doesn't care about that. He thinks people who join the military are "suckers" and "losers".