President Donald Trump listens during a news conference with NATO Secretary General Jens Stoltenberg in the East Room of the White House in Washington, Wednesday, April 12, 2017.

But in a reversal from earlier this week, Tillerson appeared to walk back previous claims of Russian complicity at a press conference following the meeting: "Assad has brought (this) upon himself", he said, adding that the USA has no "firm information" that Russia was involved in any way in the chemical weapons attack. Amid a fierce dispute over Syria, the.

This comes as the rift between the United States and Russian Federation deepens over the recent happenings in Syria.

"Frankly, Putin is backing a person that's truly an evil person", Trump said, referring to Assad.

"With its veto, Russia said "no" to accountability, Russia said "no" to cooperation with the UN's independent investigation and Russia said "no" to a resolution that would have helped to promote peace in Syria", said US Ambassador Nikki Haley.

Russian President Vladimir Putin denounced the strike as "act of aggression" and said it violated global law.

"We may be at an all-time low in terms of a relationship with Russian Federation", said Trump. I have absolutely no doubt we did the right thing.

Russian Foreign Minister Sergey Lavrov said President Trump's administration has found itself under pressure from those who "want to prevent it from curing the wounds inflicted by Barack Obama's administration and are using the Russian card in internal political struggle".

- Rep. Raul M. Grijalva (D-AZ) and the Center for Biological Diversity filed a joint lawsuit against the Trump administration in an effort to have an environmental impact survey done prior to the construction of a border wall.

The list of complaints is long, particularly on the Russian side.

Moscow has strenuously objected to Trump's decision to launch 59 U.S. Tomahawk missiles at a Syrian air base that the U.S. says was used to pummel civilians with nerve gas, resulting in 87 deaths.

Reacting to the US strike Syrian President Bashar al-Assad said Washington had carried out an "unjust and unabashed assault" against Syria which 'shows nothing but short-sightedness, a narrowness of vision and blindness to political and military realities'. "I do not know who saw them".

"There is a low level of trust between our two countries", Tillerson told reporters in Moscow.

"The world's two foremost nuclear powers can not have this type of relationship", Mr Tillerson warned.

'Our view is that the reign of the Assad family is coming to an end and they have brought that on themselves with their conduct, ' the top US diplomat said. "I suggest you look at this vote very carefully, and heed this warning". He noted a shared vision of an "uncompromising" war on terrorism. Putin chafed over Bush's support for popular revolutions against pro-Moscow leaders on Russia's borders, and strongly opposed America's 2003 Iraq invasion.

Allegations of collusion between Russian officials and Trump campaign associates also have weakened Trump's ability to make concessions to Russia on any issue, lest he be accused of rewarding bad behavior.

For Trump, the crises have come quicker and the learning curve has been faster.

"We understand each other better", Lavrov said.

In a further indication of the stark differences, Russian Federation also slammed as "unacceptable" a proposed United Nations resolution put forward by the US, Britain and France on the alleged chemical attack, and said it would veto it in its current form at a vote expected later Wednesday. Similar attempts have failed previously.

"Russia said this resolution was biased and that the Assad regime was not involved".

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