The US and other countries continually put pressure on others in an unfriendly manner though, is it worse because Russia did it?
Depends. The invasion of Iraq was certainly as bad as the invasion of Crimea imo.
Here's a quick list of what Russia has been up to in the last 15 years:
– the prosecution of an horrific war in Chechnya killing tens of thousands;
– the dismemberment of an independent oil company - Yukos - and theft of its assets;
– the expulsion of British Council offices from Russian cities;
– overt support for Yanukovych in the obviously rigged 2004 Ukrainian election;
– reneging on international treaties (Energy Charter, INF, Helsinki Accords, Budapest agreement);
– selling weapons to the Syrian regime;
– the invasion of Georgia, ripping two territories away from it;
– the invasion of Crimea, ripping it from Ukraine;
– an absence of free and fair elections;
– total control over the television media;
– a poor human rights record (assassinations of journalists, Pussy Riot’s incarceration, political prisoners etc);
– the lack of an independent judiciary;
– predatory state-owned corporate enterprises run by security service officials with little regard for sanctity of contract or corporate social responsibility.