Double agent Sergei Skripal pictured back in 2006.
He said Western sanctions for the annexation and for Moscow's support of separatists in eastern Ukraine were "illegitimate and unfair" and said that "we will win in the long run".
"Those who serve us with poison will eventually swallow it and poison themselves", he said.
Russian President Vladimir Putin defended his USA counterpart and former political ally during a high-profile interview Wednesday, but said it was Washington's political system as a whole that would ultimately lead to its downfall.
"I have no disappointment at all", Putin said about Trump during a wide-ranging interview released on social media on March 7, some two weeks before Russia's presidential election. "Moreover, on a personal level he made a very good impression on me".
He described Trump, whom he met with past year on the sidelines of summits in Germany and Vietnam, a "balanced" man who grasps the issues and is a good listener.
"I think he is a reasonable man, despite his flamboyant ways-a result of his previous activities and experience", Putin said, claiming that-while talking business-Trump "gets to the core of issues, he listens and communicates with the other party". Putin also mentioned developments in hypersonic missile technology and even a possible future laser weapon.
"I made some exaggerations", he said. When you talk about fishing, you can't help exaggerating."U.S".
"All I hear is 'meddling, interference, '" he added.
"It's quite hard to interact with such a system, because it's unpredictable", Putin said.
Moscow's hopes for better ties with Washington have been dashed by allegations of collusion between Mr Trump's campaign and Russian Federation.
Asked about the tense relationship, Putin said it's based on the West's efforts to weaken Russian Federation. "And we know that a mother's love is truly boundless", the president said.
Mr Browder is the author of a book How I Became Putin's No1 Enemy on fighting corruption in Putin's Russian Federation.
"A US-Russia Strategic Dialogue is more urgent following President Putin's public address on March 1st when he referred to several new nuclear weapons Russia is reportedly developing including a cruise missile and a nuclear underwater drone, which are not now limited by the New START treaty, and would be destabilizing if deployed", the letter to Tillerson said on Thursday.
'A decision about using nuclear weapon can be made only if our missile warning system recorded not only the launch of missiles, but also gave an accurate prediction of flight trajectories and the time when the warheads fall on Russian Federation'.
Putin added: "This is called a retaliatory, counter strike, when we receive a legal right to respond".
"Yes, it will mean a global catastrophe for mankind, for the entire world".
"We need to make sure that the innovative component of Russia's development is the main driver of the country's development".
British Prime Minister Theresa May has backed moves to snub the World Cup in Russian Federation - if Kremlin links are proven in the Salisbury contamination scare.
A FIERCE Putin critic told MPs today the Salisbury attack was a "Kremlin hit" and the Russian government wants him dead too.
Mr Skripal was convicted in 2006 of passing state secrets to MI6 before being given refuge in the United Kingdom as part of a spy swap.