The President of the United States could fly to Ukraine on an American military helicopter S-70, aka “Black Hawk”
The aircraft arrived secretly, escorted by E-3 Sentry and RC-135W Rivet Joint reconnaissance aircraft. The transponder turned on only at 13:30. It was when he landed at a military base in Polish Rzeszow.
According to the Associated Press, the United States warned Russia in advance about Biden’s trip to Kyiv. To exclude a confrontation between the two nuclear powers.