ISTANBUL — A raft of new American sanctions. An embargo on European arms sales. The indictment of a state-owned Turkish bank. Threats to isolate Turkey within NATO. A rise in global sympathy for the Kurdish cause. And the Syrian Army back in northern Syria.

The problems keep escalating for President Recep Tayyip Erdogan of Turkey, whose invasion of Kurdish-held northern Syria last week unraveled already tense relations with American and European partners and radically reshuffled the battle lines and alliances of Syria’s eight-year-old Syrian war.

But as challenging as Mr. Erdogan’s predicament appears from the outside, analysts say, it is only likely to buttress his standing at home, as the fighting fans an already heightened state of nationalist feeling.

It also masks the near-fulfillment of one of the president’s most important foreign policy goals: Breaking the stranglehold of a hostile Kurdish militia on a vast stretch of the border, and the fracturing of the United States’ alliance with a group that Mr. Erdogan considers an existential threat to the Turkish state.