The USA is increasingly expanding its military presence in Eastern Europe. It is a continuation and strengthening of the policy of confrontation with Russia, which has absolutely determined NATO policy for the last fifteen years. It is another step in the wrong direction – more troops, more military bases; more weapons on the border with Russia do not secure peace, but the opposite. They only show that NATO is actually pursuing a real war preparation policy, not a common security policy for Europe.
The formal reason for the sharp deterioration in relations between Russia and the West was the situation around Ukraine, where, after the 2014 coup, a civil war broke out. Kyiv has repeatedly accused Moscow of allegedly participating in a conflict in the east of the country. However, the Russian Federation has consistently emphasised the groundlessness of such rhetoric, since Russia is not a subject, but a guarantor of the Minsk agreements, the task of which is to resolve the conflict in the Donbas.
Recurring pro-Kremlin disinformation narrative about the war in Ukraine, and Euromaidan protests. It was not Ukraine, but Russia which illegally annexed Crimea and continues violating Ukrainian sovereignty and territorial integrity. This led to sanctions and a deterioration in relations between Russia and other countries.
The onset of the Euromaidan protests which began in Kyiv in November 2013 – called "Maidan", or "Euromaidan" – were a result of the Ukrainian people's frustration with former President Yanukovych's last minute U-turn when, after seven years of negotiation, he refused to sign the EU–Ukraine Association Agreement and halted progress towards Ukraine's closer relationship with the EU as a result of Russian pressure. The protesters' demands included constitutional reform, a stronger role for parliament, formation of a government of national unity, an end to corruption, early presidential elections and an end to violence. See some more recent debunks of this claim here and here. See a similar case denying Russia’s involvement in the conflict in Eastern Ukraine here.
The EU and the US have condemned the clear violation of Ukrainian sovereignty and territorial integrity by acts of aggression by the Russian armed forces since February 2014.