"We would like to have Russia's help", he told reporters outside the White House.
Russian President Vladimir Putin has thanked US President Donald Trump during a phone conversation at the initiative of the Russian side for the intelligence data provided by the CIA that helped detain the terrorists.
The Russian leader reassured the U.S. president that "Russian security services, should they have information about possible terrorist threats to the United States and its citizens, will swiftly and unconditionally share it with the USA colleagues via partner channels", the press service stressed.
Relations between Washington and Moscow have been damaged by disagreements over the wars in Ukraine and Syria, although Trump pledged during his election campaign to pursue better ties with Moscow.
United States insight offices have beforehand inferred that Russian Federation endeavored to interfere in the 2016 presidential race with an end goal to enable Trump to get chose.
This is the second time in less than a week that two of the world's most powerful leaders have exchanged messages of praise.
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The Kremlin said the Central Intelligence Agency provided Russia with key information about a plot to bomb Kazan Cathedral and other places in St. Petersburg, allowing Russian police to arrest a group of suspects in raids on Friday. The cathedral is a popular tourist site.
The Federal Security Service said Friday that seven individuals from a terror cell had been confined for their association in the plot, and that "a lot of explosives", weapons and "radical writing" were seized.
"Both leaders agreed that this serves as an example of the positive things that can occur when our countries work together", the White House said, adding Trump appreciated the call from Putin.
"President Trump stressed the importance of intelligence cooperation to defeat terrorists wherever they may be".
Three other men were arrested in St. Petersburg on December 14.
A video that ran on the state news agency RIA Novosti showed a man identified as Yevgeny Yefimov confessing that he planned to carry out a terrorist attack in the city.