Eastern Europe when occupied by the Russians, the Generals that won WWII, objected when they wanted to.
Now that NATO has expanded east, and EU Membership, they are objecting again. Islamic Invasion is not popular, they have dealt with it before, for hundreds of years. Western Europe does not know what Islam is like in person.
Western Europe is many small countries with ocean trade. Denmark, Holland, Belgium, and others to small to notice.
Eastern Europe is larger, landlocked, poorer, and has an economy based on agriculture.
They have a lot more in common with Russia.
Sanctions from The Boss of Europe, fell heavy on the economies of Eastern Europe. Germany lost 5%, Poland lost more than half.
Countries bordering Russia have a large market for their produce, or did.
No one is making up their losses, and America wants them to spend 2% of their GDP on NATO.
They are also making them a target by basing missiles there.
They have been captured and put on a Western Europe leash, the Russians built railroads, roads, schools, hospitals, and housing. The EU has given cheap debt to political leaders who are no longer in office, they bought a vineyard in France, and has taken their brightest and best to work menial jobs in Western Europe, for Eastern wages.
Western Europe welcoming the Islamic State is the last straw. The old Warsaw Pact would be better off on its own, as a buffer between Europe and Russia. Open trade with both, and self rule at home.
On the world stage they were small and poor countries that fought for their freedom over and over again. Islam, Russians, Mongols, Germans, French, they beat each in turn.
Telling them they have to open their borders to the Islamic State, fly a Rainbow flag, and forbidding exports to Russia is not going to be accepted. When the American Army tours Eastern Europe in tanks, they are claiming it. Where were they in 1945?
Americans and Europeans did not help in Hungary, 1956, or in Prague, or Poland. After the Soviet Union withdrew, the West gave no aid, and their economies remained isolated. The Soviet Union, then Russia, continued aid and trade.
The Great Colonial Powers, their Colonials, and Military Alliances, are not good at making friends.
I can see why they identify with the Islamic State. They have a common world view.