If by "self interest", you mean self interest of the NATION, then ABSOLUTELY YES. That is what nations are SUPPOSED to do, not put the interests of other nations above their own, as goofball Biden does (ex. closed down the Keystone Pipeline, putting thousands of Americans out of jobs, and harming our energy independence, while giving his approval to the Nord Stream 2 European pipeline.)
And instead of putting AMERICA FIRST, as Trump did, Democrats put other countries ahead of our own interests, because they really don't have a NATION at all. They are globalists.
There IS evidence of Democrats being communists. We were talking about nationalism. In that respect, Democrats are communistic, in that they are globalist who do not see the USA as a nation (or any other nation as a nation) but instead see all the world as being one large entity, without borders and divisions.
The current open borders policy of the Biden administration is one example. Another is when Obama gave a speech in Germany, and he told the Germans >> "I am a citizen of the world.", which is why he was sharply criticized by 2012 conservative presidential candidate Virgil Goode, who said "You're supposed to be a citizen of the United States, and as a US president, representing the American people, not the world."
But Obama was too GLOBALIST-STUPID to even comprehend what Virgil Goode was telling him. Democrat-Globalist loons lost in a fog of globalist lunacy.