"I believe he [Trump] is just saying things, and if he is accidentally elected, his position will change 180 degrees," believes Benediktas Juodka, chairman of the Foreign Affairs Committee at the Lithuanian parliament.

"The populist card may be used in election campaigns in any country, also in the United States," he adds.

MP Gediminas Kirkilas, chairman of the European Affairs Committee, has noted that Trump's statements in a recent speech he gave on foreign policy were conflicting.

"Trump's statements are highly conflicting, he says something in one place and something entirely different in another. Of course, there are plenty of alarming signs. If America becomes isolated in case of Trump's election as president, which I don't believe will happen, it will not be a good thing for Europe," said Kirkilas.

Meanwhile, Foreign Minister Linas Linkevičius refused to comment on aspects of US domestic politics, saying that it was characterised "a large number of emotions and catchwords".

Trump, the frontrunner for the Republican candidacy in the 2016 presidential race, said this week he would pursue an "America First" policy.

New talks would be sought with the United States' allies in NATO, Trump said. He said he would try and reshape the organisation's structure and discuss a "rebalancing" of US financing towards it.

"The countries we defend must pay for the cost of this defence," he said. "If not, the US must be prepared to let these countries defend themselves. We have no choice."

Trump said he would also aim to hold talks with Russia to seek common ground, possibly over Islamist extremism.