He said this at his press conference on Thursday, Censor.NET reports citing Ukrainian News.
"I stressed in my yesterday's address (to the Parliament - ed.) that the level of threat of Russian invasion is unprecedentedly high," the President said.
He noted that due to this fact Ukraine is forced to keep more than 50 thousand servicemen deployed in the anti-terrorist operation area and provide them with equipment.
In addition, the president noted that there has not been such a large build-up of Russian troops and military equipment near the border with Ukraine since August 2014.
Earlier, Poroshenko estimated the number of Russian troops in the Donbas to be 11,000.