The anti-missile site close to Poland’s northern Baltic Sea coast is part of a NATO defensive umbrella that, when complete, will stretch from Greenland to the Azores.
Poland’s defense ministry said US authorities had told it there had been construction delays at the Redzikowo site that were the responsibility of the contractor.
The US head of the US Missile Defence Agency (MDA), Lieutenant General Samuel Greaves, acknowledged the delay at a US Senate hearing on Thursday.
The MDA, a unit of the US Defense Department, is overseeing installation of the Lockheed Martin Co-made ground-based Aegis ballistic missile defense system.
“While we have experienced delays in the military construction portion of the Aegis Ashore effort in Poland, we remain steadfastly committed to delivery of that capability,” Greaves said.
Officials from the US-led NATO alliance, who took control of the umbrella in 2016, have said the whole system is supposed to defend against attacks by states such as Iran and groups such as al-Qaeda.
But the scheme has angered Russia, incensed by the show of force by its old Cold War rival in formerly-Communist Eastern Europe.
Poland’s former defense minister, Tomasz Siemoniak, from the opposition Civic Platform party, said the delay was meant as a political rebuke to the current government.
“This is the price for the … lack of trust in PiS (the ruling conservative Law and Justice party),” Siemoniak told Reuters.
Washington sharply criticised a bill that Poland adopted in January that imposes jail terms for suggesting Poland was complicit in the Holocaust, saying it was concerned about the repercussions it could have “on Poland’s strategic interests and relationships”.
Siemoniak said that “in the context of the (Holocaust bill), the lack of trust has deepened … ‘Technical reasons’ are just a pretext to postpone it until the year 2020. I am convinced that the situation is a result of the deterioration of the allied relations.”
Bartosz Cichocki, a deputy foreign minister, told the PAP state news agency that there was no crisis in Polish-American relations and that the US had informed Poland about the potential delay “weeks before” the Holocaust law was adopted.
As part of the shield, the United States switched on an US$800 million (RM3.1 million) site in Romania in May 2016 and broke ground at the site in Poland later that year.
The full shield also includes ships and radar installations across Europe, with command and control run from a US air base in Germany.