US President Donald Trump has said he is considering sending 2,000 more troops to Poland.
He made the announcement after a meeting with his Polish counterpart Andrzej Duda at the White House talks.
President Trump stopped short of promising a permanent presence in Poland.
He said the additional US troops would be moved to Poland from fellow NATO-member Germany, but cautioned that the discussions had not been finalized.
"They're talking about 2,000 troops," he said.
Around 5,000 US troops currently rotate in and out of Poland.
According to Mr Trump, Poland is offering to build a "world class base" for the US troops and he said "this would be a statement."
But he poured cold water on his Polish allies' hopes for a full-blown permanent US facility - something that would irritate the Kremlin and almost certainly prompt a Russian response.
"I don't talk about permanence or not permanence," he said.
Trump said Poland was ordering more than 30 F-35 combat aircraft.
In a highly unusual move, two of the advanced planes flew over the White House during Duda's visit to show off their moves.