<article class="frunze-view">
  <nav class="frunze-view-nav">
    <a href="/promo" class="frunze-nav-link frunze-nav-logo">&#966;</a>
    <a href="/promo/projects" class="frunze-nav-link frunze-nav-link--active">Projects</a>
    <a href="/promo/updates" class="frunze-nav-link">Updates</a>
    <a href="/promo/help" class="frunze-nav-link">Help</a>
  </nav>
  <section class="frunze-view-content">
    <router-outlet></router-outlet>
  </section>
</article>

<article class="frunze-view">
  <nav class="frunze-view-nav">
    <a routerLink="/promo" class="frunze-nav-link frunze-nav-logo">&#966;</a>
    <a routerLink="/promo/projects" routerLinkActive="frunze-nav-link--active" class="frunze-nav-link">
      Projects
    </a>
    <a routerLink="/promo/updates" routerLinkActive="frunze-nav-link--active" class="frunze-nav-link">
      Updates
    </a>
    <a routerLink="/promo/help" routerLinkActive="frunze-nav-link--active" class="frunze-nav-link">
      Help
    </a>
  </nav>
  <section class="frunze-view-content">
    <router-outlet></router-outlet>
  </section>
</article>

Use RouterLink for all navigation links instead of plain "a" links.
Use RouterLink for all navigation links instead of plain "a" links.
