Tusk's comment was a reference to a slogan favoured by Poland's anti-Soviet Solidarity freedom movement in the 1980s.
Russian Federation cites the same concerns regarding the United States and its allies, who contibute millions of dollars per year for these type of activities against Russia's government through USA -funded bodies such as the National Endowment for Democracy and Radio Free Europe.
The measures to be ordered in Warsaw, which complement national actions by the USA and some other allies, constitute "the most significant accomplishment of alliance deterrence and defence in decades", Polish NATO Ambassador Jacek Najder told a pre-summit media briefing in Brussels.
Wednesday's meeting will above all be about transparency and an exchange of information on both sides to avert risks, according to German Chancellor Angela Merkel, who cited some "really risky situations" that have arisen in the Baltic region.
Canadian Prime Minister Justin Trudeau arrives with Foreign Affairs Minister Stephane Dion and Minister of National Defence Minister Harjit Sajjan at the North Atlantic Treaty Organisation summit in Warsaw, Friday July 8, 2016.
"We must accept that Russian Federation can be a competitor, adversary, peer or partner and probably all four at the same time", he said. British leader David Cameron said he would send 500 men to Estonia and 150 to Poland. Britain voted two weeks ago to split from the European Union, a landmark move that threatens the entire post-World War II project.
Canadian Prime Minister Justin Trudeau and his son Xavier disembark a government plane as they arrive in Warsaw, Poland, Friday July 8, 2016.
For the first time in NATO's history, it has a 13,000 troop high-readiness force, now based in Spain - President Obama's next stop.
"The backdrop to this summit is the historic decision taken last month to leave the European Union but this summit will be an opportunity for us to demonstrate the enormous contribution that Britain makes to Europe's and NATO's security and that we will continue to do so even outside of the EU", a British government official said.
"No there were no calls for an increase in the number of soldiers today". "That's why we welcome American troops into Poland and why we are also happy a heavy brigade of the USA will operate in Poland".
Von der Leyen said Poland and the Baltic states want greater protection because Russia's 2014 annexation of Crimea from Ukraine has proven Moscow "doesn't respect borders". Its delegation is headed by Mohammed Al Bowardi, Minister of State for Defence Affairs, and its participation reflects the nation's key role in combating terrorism and regional instability.
Russia's support to rebels in Ukraine;s Donbass region has concerned Western countries.
The military alliance also committed to stationing four battalions along NATO-member borders with Russian Federation - in Poland, Estonia, Latvia, and Lithuania - but stressed that "NATO poses no threat to any country", said Stoltenberg.
The French president's remark not only summed up NATO's complex relationship with its largest and most aggressive neighbor; it also revealed how its 28 leaders are struggling to come up with a unified message to send to Vladimir Putin more than two years after he snatched Crimea from Ukraine. That includes crossing into their territory, inciting Russian speakers within their borders and cyber attacks. But NATO Secretary General Jens Stoltenberg "has been clear this is an open-ended commitment", Vance pointed out. "We can not lose sight of the achievement" that European integration has made, he said, noting that no EU member has ever raised arms against another.